Uses of Class
java.lang.Object

Packages that use Object

java.applet	Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context.
java.awt	Contains all of the classes for creating user interfaces and for painting graphics and images.
java.awt.color	Provides classes for color spaces.
java.awt.datatransfer	Provides interfaces and classes for transferring data between and within applications.
java.awt.event	Provides interfaces and classes for dealing with different types of events fired by AWT components.
java.awt.image	Provides classes for creating and modifying images.
java.beans	Contains classes for run-time Java Beans support.
java.io
java.lang
java.lang.ref
java.lang.reflect
java.math	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net
java.rmi	Provides the RMI package.
java.security
java.security.acl
java.security.cert
java.security.spec
java.text
java.util
java.util.jar
java.util.zip
javax.microedition.io	The classes for the generic connections.
javax.microedition.xlet	Provides interfaces used by applications and the application manager to communicate.
javax.microedition.xlet.ixc	Provides facilities for inter-Xlet communication (IXC).

Uses of Object in java.applet

Subclasses of Object in java.applet

class

Applet An applet is a small program that is intended not to be run on its own, but rather to be embedded inside another application.

Uses of Object in java.awt

Subclasses of Object in java.awt

class	AlphaComposite This AlphaComposite class implements the basic alpha compositing rules for combining source and destination pixels to achieve blending and transparency effects with graphics and images.
class	AWTError Thrown when a serious Abstract Window Toolkit error has occurred.
class	AWTEvent The root event class for all AWT events.
class	AWTEventMulticaster A class which implements efficient and thread-safe multi-cast event dispatching for the AWT events defined in the java.awt.event package.
class	AWTException Signals that an Absract Window Toolkit exception has occurred.
class	AWTPermission This class is for AWT permissions.
class	BorderLayout A border layout lays out a container, arranging and resizing its components to fit in five regions: north, south, east, west, and center.
class	Button This class creates a labeled button.
class	Canvas A Canvas component represents a blank rectangular area of the screen onto which the application can draw or from which the application can trap input events from the user.
class	CardLayout A CardLayout object is a layout manager for a container.
class	Checkbox A check box is a graphical component that can be in either an "on" (true) or "off" (false) state.
class	CheckboxGroup The CheckboxGroup class is used to group together a set of Checkbox buttons.
class	CheckboxMenuItem This class represents a check box that can be included in a menu.
class	Choice The Choice class presents a pop-up menu of choices.
class	Color The Color class is used encapsulate colors in the default sRGB color space or colors in arbitrary color spaces identified by a ColorSpace.
class	Component A component is an object having a graphical representation that can be displayed on the screen and that can interact with the user.
class	Container A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components.
class	Cursor A class to encapsulate the bitmap representation of the mouse cursor.
class	Dialog A Dialog is a top-level window with a title and a border that is typically used to take some form of input from the user.
class	Dimension The Dimension class encapsulates the width and height of a component (in integer precision) in a single object.
class	Event Event is a platform-independent class that encapsulates events from the platform's Graphical User Interface in the Java 1.0 event model.
class	EventQueue EventQueue is a platform-independent class that queues events, both from the underlying peer classes and from trusted application classes.
class	FileDialog The FileDialog class displays a dialog window from which the user can select a file.
class	FlowLayout A flow layout arranges components in a left-to-right flow, much like lines of text in a paragraph.
class	Font The Font class represents fonts.
class	FontMetrics The FontMetrics class defines a font metrics object, which encapsulates information about the rendering of a particular font on a particular screen.
class	Frame A Frame is a top-level window with a title and a border.
class	Graphics The Graphics class is the abstract base class for all graphics contexts that allow an application to draw onto components that are realized on various devices, as well as onto off-screen images.
class	Graphics2D This Graphics2D class extends the Graphics class to provide more sophisticated control over graphics operations.
class	GraphicsConfiguration The GraphicsConfiguration class describes the characteristics of a graphics destination such as a printer or monitor.
class	GraphicsDevice The GraphicsDevice class describes the graphics devices that might be available in a particular graphics environment.
class	GraphicsEnvironment The GraphicsEnvironment class describes the collection of GraphicsDevice objects and Font objects available to a Java(tm) application on a particular platform.
class	GridBagConstraints The GridBagConstraints class specifies constraints for components that are laid out using the GridBagLayout class.
class	GridBagLayout The GridBagLayout class is a flexible layout manager that aligns components vertically and horizontally, without requiring that the components be of the same size.
class	GridLayout The GridLayout class is a layout manager that lays out a container's components in a rectangular grid.
class	IllegalComponentStateException Signals that an AWT component is not in an appropriate state for the requested operation.
class	Image The abstract class Image is the superclass of all classes that represent graphical images.
class	Insets An Insets object is a representation of the borders of a container.
class	Label A Label object is a component for placing text in a container.
class	List The List component presents the user with a scrolling list of text items.
class	MediaTracker The MediaTracker class is a utility class to track the status of a number of media objects.
class	Menu A Menu object is a pull-down menu component that is deployed from a menu bar.
class	MenuBar The MenuBar class encapsulates the platform's concept of a menu bar bound to a frame.
class	MenuComponent The abstract class MenuComponent is the superclass of all menu-related components.
class	MenuItem All items in a menu must belong to the class MenuItem, or one of its subclasses.
class	MenuShortcut A class which represents a keyboard accelerator for a MenuItem.
class	Panel Panel is the simplest container class.
class	Point A point representing a location in (x, y) coordinate space, specified in integer precision.
class	Polygon The Polygon class encapsulates a description of a closed, two-dimensional region within a coordinate space.
class	PopupMenu A class that implements a menu which can be dynamically popped up at a specified position within a component.
class	Rectangle A Rectangle specifies an area in a coordinate space that is enclosed by the Rectangle object's top-left point (x, y) in the coordinate space, its width, and its height.
class	Scrollbar The Scrollbar class embodies a scroll bar, a familiar user-interface object.
class	ScrollPane A container class which implements automatic horizontal and/or vertical scrolling for a single child component.
class	SystemColor A class to encapsulate symbolic colors representing the color of GUI objects on a system.
class	TextArea A TextArea object is a multi-line region that displays text.
class	TextComponent The TextComponent class is the superclass of any component that allows the editing of some text.
class	TextField A TextField object is a text component that allows for the editing of a single line of text.
class	Toolkit This class is the abstract superclass of all actual implementations of the Abstract Window Toolkit.
class	Window A Window object is a top-level window with no borders and no menubar.

Fields in java.awt declared as Object

static Object	Image.UndefinedProperty The UndefinedProperty object should be returned whenever a property which was not defined for a particular image is fetched.
Object	Event.target The target component.
Object	Event.arg An arbitrary argument of the event.

Methods in java.awt that return Object

Object[]	MediaTracker.getErrorsAny() Returns a list of all media that have encountered an error.
Object[]	MediaTracker.getErrorsID(int id) Returns a list of media with the specified ID that have encountered an error.
protected Object	MenuComponent.getTreeLock() Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.
Object[]	List.getSelectedObjects() Returns the selected items on the list in an array of Objects.
Object[]	ItemSelectable.getSelectedObjects() Returns the selected items or null if no items are selected.
Object	GridBagConstraints.clone() Creates a copy of this grid bag constraint.
abstract Object	Image.getProperty(String name, ImageObserver observer) Gets a property of this image by name.
Object	Insets.clone() Create a copy of this object.
Object[]	CheckboxMenuItem.getSelectedObjects() Returns the an array (length 1) containing the checkbox menu item label or null if the checkbox is not selected.
Object	Component.getTreeLock() Gets the locking object for AWT component-tree and layout Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.
Object[]	Choice.getSelectedObjects() Returns an array (length 1) containing the currently selected item.
Object[]	Checkbox.getSelectedObjects() Returns an array (length 1) containing the checkbox label or null if the checkbox is not selected.

Methods in java.awt with parameters of type Object

boolean	AlphaComposite.equals(Object obj) Tests if the specified Object is equal to this AlphaComposite object.
protected void	ScrollPane.addImpl(Component comp, Object constraints, int index) Adds the specified component to this scroll pane container.
boolean	Point.equals(Object obj) Determines whether an instance of Point2D is equal to this point.
boolean	MenuShortcut.equals(Object obj) Returns whether this MenuShortcut is the same as another: equality is defined to mean that both MenuShortcuts use the same key and both either use or don't use the SHIFT key.
void	LayoutManager2.addLayoutComponent(Component comp, Object constraints) Adds the specified component to the layout, using the specified constraint object.
boolean	Rectangle.equals(Object obj) Checks whether two rectangles are equal.
void	GridBagLayout.addLayoutComponent(Component comp, Object constraints) Adds the specified component to the layout, using the specified constraint object.
boolean	Font.equals(Object obj) Compares this Font object to the specified Object.
void	Container.add(Component comp, Object constraints) Adds the specified component to the end of this container.
void	Container.add(Component comp, Object constraints, int index) Adds the specified component to this container with the specified constraints at the specified index.
protected void	Container.addImpl(Component comp, Object constraints, int index) Adds the specified component to this container at the specified index.
boolean	Insets.equals(Object obj) Checks whether two insets objects are equal.
boolean	Dimension.equals(Object obj) Checks whether two dimension objects have equal values.
boolean	Color.equals(Object obj) Determines whether another object is equal to this Color.
void	CardLayout.addLayoutComponent(Component comp, Object constraints) Adds the specified component to this card layout's internal table of names.
boolean	Component.action(Event evt, Object what) Deprecated. As of JDK version 1.1, should register this component as ActionListener on component which fires action events.
boolean	Component.gotFocus(Event evt, Object what) Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).
boolean	Component.lostFocus(Event evt, Object what) Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).
void	BorderLayout.addLayoutComponent(Component comp, Object constraints) Adds the specified component to the layout, using the specified constraint object.

Constructors in java.awt with parameters of type Object

Event(Object target, long when, int id, int x, int y, int key, int modifiers, Object arg)
Creates an instance of Event with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and argument.

Event(Object target, long when, int id, int x, int y, int key, int modifiers, Object arg)
Creates an instance of Event with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and argument.

Event(Object target, long when, int id, int x, int y, int key, int modifiers)
Creates an instance of Event, with the specified target component, time stamp, event type, x and y coordinates, keyboard key, state of the modifier keys, and an argument set to null.

Event(Object target, int id, Object arg)
Creates an instance of Event with the specified target component, event type, and argument.

Event(Object target, int id, Object arg)
Creates an instance of Event with the specified target component, event type, and argument.

AWTEvent(Object source, int id)
Constructs an AWTEvent object with the specified source object and type.

Uses of Object in java.awt.color

Subclasses of Object in java.awt.color

class

ColorSpace This abstract class is used to serve as a color space tag to identify the specific color space of a Color object or, via a ColorModel object, of an Image, a BufferedImage, or a GraphicsDevice.

Uses of Object in java.awt.datatransfer

Subclasses of Object in java.awt.datatransfer

class	Clipboard A class which implements a mechanism to transfer data using cut/copy/paste operations.
class	DataFlavor Each instance represents the opaque concept of a data format as would appear on a clipboard, during drag and drop, or in a file system.
class	StringSelection A Transferable which implements the capability required to transfer a String.
class	UnsupportedFlavorException Signals that the requested data is not supported in this flavor.

Methods in java.awt.datatransfer that return Object

Object	StringSelection.getTransferData(DataFlavor flavor) Returns the Transferable's data in the requested DataFlavor if possible.
Object	Transferable.getTransferData(DataFlavor flavor) Returns an object which represents the data to be transferred.
Object	DataFlavor.clone()

Methods in java.awt.datatransfer with parameters of type Object

Transferable	Clipboard.getContents(Object requestor) Returns a transferable object representing the current contents of the clipboard.
boolean	DataFlavor.equals(Object o) If the object is an instance of DataFlavor, representationClass and MIME type will be compared.

Uses of Object in java.awt.event

Subclasses of Object in java.awt.event

class	ActionEvent A semantic event which indicates that a component-defined action occured.
class	AdjustmentEvent The adjustment event emitted by Adjustable objects.
class	ComponentAdapter An abstract adapter class for receiving component events.
class	ComponentEvent A low-level event which indicates that a component moved, changed size, or changed visibility (also, the root class for the other component-level events).
class	ContainerAdapter An abstract adapter class for receiving container events.
class	ContainerEvent A low-level event which indicates that a container's contents changed because a component was added or removed.
class	FocusAdapter An abstract adapter class for receiving keyboard focus events.
class	FocusEvent A low-level event which indicates that a component has gained or lost the keyboard focus.
class	InputEvent The root event class for all component-level input events.
class	InvocationEvent An event which executes the run() method on a Runnable when dispatched by the AWT event dispatcher thread.
class	ItemEvent A semantic event which indicates that an item was selected or deselected.
class	KeyAdapter An abstract adapter class for receiving keyboard events.
class	KeyEvent An event which indicates that a keystroke occurred in a component.
class	MouseAdapter An abstract adapter class for receiving mouse events.
class	MouseEvent An event which indicates that a mouse action occurred in a component.
class	MouseMotionAdapter An abstract adapter class for receiving mouse motion events.
class	PaintEvent The component-level paint event.
class	TextEvent A semantic event which indicates that an object's text changed.
class	WindowAdapter An abstract adapter class for receiving window events.
class	WindowEvent A low-level event which indicates that a window has changed its status.

Fields in java.awt.event declared as Object

protected Object

InvocationEvent.notifier The (potentially null) Object whose notifyAll() method will be called immediately after the Runnable.run() method returns.

Methods in java.awt.event that return Object

Object

ItemEvent.getItem() Returns the item affected by the event.

Methods in java.awt.event with parameters of type Object

void	KeyEvent.setSource(Object newSource) Set the source of this KeyEvent.

Constructors in java.awt.event with parameters of type Object

InvocationEvent(Object source, Runnable runnable)
Constructs an InvocationEvent with the specified source which will execute the runnable's run() method when dispatched.

InvocationEvent(Object source, Runnable runnable, Object notifier, boolean catchExceptions)
Constructs an InvocationEvent with the specified source which will execute the runnable's run() method when dispatched.

InvocationEvent(Object source, Runnable runnable, Object notifier, boolean catchExceptions)
Constructs an InvocationEvent with the specified source which will execute the runnable's run() method when dispatched.

InvocationEvent(Object source, int id, Runnable runnable, Object notifier, boolean catchExceptions)
Constructs an InvocationEvent with the specified source and ID which will execute the runnable's run() method when dispatched.

InvocationEvent(Object source, int id, Runnable runnable, Object notifier, boolean catchExceptions)
Constructs an InvocationEvent with the specified source and ID which will execute the runnable's run() method when dispatched.

TextEvent(Object source, int id)
Constructs a TextEvent object.

ItemEvent(ItemSelectable source, int id, Object item, int stateChange)
Constructs an ItemEvent object.

ActionEvent(Object source, int id, String command)
Constructs an ActionEvent object.

ActionEvent(Object source, int id, String command, int modifiers)
Constructs an ActionEvent object with modifier keys.

Uses of Object in java.awt.image

Subclasses of Object in java.awt.image

class	AreaAveragingScaleFilter An ImageFilter class for scaling images using a simple area averaging algorithm that produces smoother results than the nearest neighbor algorithm.
class	BufferedImage The BufferedImage subclass describes an Image with an accessible buffer of image data.
class	ColorModel The ColorModel abstract class encapsulates the methods for translating a pixel value to color components (for example, red, green, and blue) and an alpha component.
class	CropImageFilter An ImageFilter class for cropping images.
class	DataBuffer The DataBuffer class defines data storage formats used in various image operations.
class	DirectColorModel The DirectColorModel class is a ColorModel class that works with pixel values that represent RGB color and alpha information as separate samples and that pack all samples for a single pixel into a single int, short, or byte quantity.
class	FilteredImageSource This class is an implementation of the ImageProducer interface which takes an existing image and a filter object and uses them to produce image data for a new filtered version of the original image.
class	ImageFilter This class implements a filter for the set of interface methods that are used to deliver data from an ImageProducer to an ImageConsumer.
class	IndexColorModel The IndexColorModel class is a ColorModel class that works with pixel values consisting of a single sample which is an index into a fixed colormap in the default sRGB ColorSpace.
class	MemoryImageSource This class is an implementation of the ImageProducer interface which uses an array to produce pixel values for an Image.
class	PixelGrabber The PixelGrabber class implements an ImageConsumer which can be attached to an Image or ImageProducer object to retrieve a subset of the pixels in that image.
class	RasterFormatException The RasterFormatException is thrown if there is invalid layout information in a BufferedImage.
class	ReplicateScaleFilter An ImageFilter class for scaling images using the simplest algorithm.
class	RGBImageFilter This class provides an easy way to create an ImageFilter which modifies the pixels of an image in the default RGB ColorModel.

Fields in java.awt.image declared as Object

protected Object

ReplicateScaleFilter.outpixbuf A byte array initialized with a size of ReplicateScaleFilter.destWidth and used to deliver a row of pixel data to the ImageConsumer.

Methods in java.awt.image that return Object

Object	BufferedImage.getProperty(String name, ImageObserver observer) Returns a property of the image by name.
Object	BufferedImage.getProperty(String name) Returns a property of the image by name.
Object	PixelGrabber.getPixels() Get the pixel buffer.
Object	ImageFilter.clone() Clones this object.

Methods in java.awt.image with parameters of type Object

boolean

ColorModel.equals(Object obj) Tests if the specified Object is an instance of ColorModel and if it equals this ColorModel.

Uses of Object in java.beans

Subclasses of Object in java.beans

class	Beans This class provides some general purpose beans control methods.
class	PropertyChangeEvent A "PropertyChange" event gets delivered whenever a bean changes a "bound" or "constrained" property.
class	PropertyChangeSupport This is a utility class that can be used by beans that support bound properties.
class	PropertyVetoException A PropertyVetoException is thrown when a proposed change to a property represents an unacceptable value.
class	VetoableChangeSupport This is a utility class that can be used by beans that support constrained properties.

Methods in java.beans that return Object

Object	PropertyChangeEvent.getNewValue() Sets the new value for the property, expressed as an Object.
Object	PropertyChangeEvent.getOldValue() Gets the old value for the property, expressed as an Object.
Object	PropertyChangeEvent.getPropagationId() The "propagationId" field is reserved for future use.
static Object	Beans.instantiate(ClassLoader cls, String beanName) Instantiate a JavaBean.

Methods in java.beans with parameters of type Object

void	PropertyChangeSupport.firePropertyChange(String propertyName, Object oldValue, Object newValue) Report a bound property update to any registered listeners.
void	PropertyChangeSupport.firePropertyChange(String propertyName, Object oldValue, Object newValue) Report a bound property update to any registered listeners.
void	PropertyChangeEvent.setPropagationId(Object propagationId) Sets the propagationId object for the event.
void	VetoableChangeSupport.fireVetoableChange(String propertyName, Object oldValue, Object newValue) Report a vetoable property update to any registered listeners.
void	VetoableChangeSupport.fireVetoableChange(String propertyName, Object oldValue, Object newValue) Report a vetoable property update to any registered listeners.

Constructors in java.beans with parameters of type Object

PropertyChangeSupport(Object sourceBean)
Constructs a PropertyChangeSupport object.

PropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue)
Constructs a new PropertyChangeEvent.

PropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue)
Constructs a new PropertyChangeEvent.

PropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue)
Constructs a new PropertyChangeEvent.

VetoableChangeSupport(Object sourceBean)
Constructs a VetoableChangeSupport object.

Uses of Object in java.io

Subclasses of Object in java.io

class	BufferedInputStream A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods.
class	BufferedOutputStream The class implements a buffered output stream.
class	BufferedReader Read text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
class	BufferedWriter Write text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
class	ByteArrayInputStream A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
class	ByteArrayOutputStream This class implements an output stream in which the data is written into a byte array.
class	CharArrayReader This class implements a character buffer that can be used as a character-input stream.
class	CharArrayWriter This class implements a character buffer that can be used as an Writer.
class	CharConversionException Base class for character conversion exceptions.
class	DataInputStream A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
class	DataOutputStream A data input stream lets an application write primitive Java data types to an output stream in a portable way.
class	EOFException Signals that an end of file or end of stream has been reached unexpectedly during input.
class	File An abstract representation of file and directory pathnames.
class	FileDescriptor Instances of the file descriptor class serve as an opaque handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes.
class	FileInputStream A FileInputStream obtains input bytes from a file in a file system.
class	FileNotFoundException Signals that an attempt to open the file denoted by a specified pathname has failed.
class	FileOutputStream A file output stream is an output stream for writing data to a File or to a FileDescriptor.
class	FilePermission This class represents access to a file or directory.
class	FileReader Convenience class for reading character files.
class	FileWriter Convenience class for writing character files.
class	FilterInputStream A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
class	FilterOutputStream This class is the superclass of all classes that filter output streams.
class	FilterReader Abstract class for reading filtered character streams.
class	FilterWriter Abstract class for writing filtered character streams.
class	InputStream This abstract class is the superclass of all classes representing an input stream of bytes.
class	InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and translates them into characters according to a specified character encoding.
class	InterruptedIOException Signals that an I/O operation has been interrupted.
class	InvalidClassException Thrown when the Serialization runtime detects one of the following problems with a Class.
class	InvalidObjectException Indicates that one or more deserialized objects failed validation tests.
class	IOException Signals that an I/O exception of some sort has occurred.
class	LineNumberReader A buffered character-input stream that keeps track of line numbers.
class	NotActiveException Thrown when serialization or deserialization is not active.
class	NotSerializableException Thrown when an instance is required to have a Serializable interface.
class	ObjectInputStream An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
static class	ObjectInputStream.GetField Provide access to the persistent fields read from the input stream.
class	ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
static class	ObjectOutputStream.PutField Provide programatic access to the persistent fields to be written to ObjectOutput.
class	ObjectStreamClass Serialization's descriptor for classes.
class	ObjectStreamException Superclass of all exceptions specific to Object Stream classes.
class	ObjectStreamField A description of a Serializable field from a Serializable class.
class	OptionalDataException Unexpected data appeared in an ObjectInputStream trying to read an Object.
class	OutputStream This abstract class is the superclass of all classes representing an output stream of bytes.
class	OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are translated into bytes according to a specified character encoding.
class	PipedInputStream A piped input stream should be connected to a piped output stream; the piped input stream then provides whatever data bytes are written to the piped output stream.
class	PipedOutputStream A piped output stream can be connected to a piped input stream to create a communications pipe.
class	PipedReader Piped character-input streams.
class	PipedWriter Piped character-output streams.
class	PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
class	PrintWriter Print formatted representations of objects to a text-output stream.
class	PushbackInputStream A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" one byte.
class	PushbackReader A character-stream reader that allows characters to be pushed back into the stream.
class	RandomAccessFile Instances of this class support both reading and writing to a random access file.
class	Reader Abstract class for reading character streams.
class	SequenceInputStream A SequenceInputStream represents the logical concatenation of other input streams.
class	SerializablePermission This class is for Serializable permissions.
class	StreamCorruptedException Thrown when control information that was read from an object stream violates internal consistency checks.
class	StreamTokenizer The StreamTokenizer class takes an input stream and parses it into "tokens", allowing the tokens to be read one at a time.
class	StringReader A character stream whose source is a string.
class	StringWriter A character stream that collects its output in a string buffer, which can then be used to construct a string.
class	SyncFailedException Signals that a sync operation has failed.
class	UnsupportedEncodingException The Character Encoding is not supported.
class	UTFDataFormatException Signals that a malformed UTF-8 string has been read in a data input stream or by any class that implements the data input interface.
class	WriteAbortedException Signals that one of the ObjectStreamExceptions was thrown during a write operation.
class	Writer Abstract class for writing to character streams.

Fields in java.io declared as Object

protected Object	Reader.lock The object used to synchronize operations on this stream.
protected Object	Writer.lock The object used to synchronize operations on this stream.

Methods in java.io that return Object

Object	ObjectInput.readObject() Read and return an object.
Object	ObjectInputStream.readObject() Read an object from the ObjectInputStream.
protected Object	ObjectInputStream.readObjectOverride() This method is called by trusted subclasses of ObjectOutputStream that constructed ObjectOutputStream using the protected no-arg constructor.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.
abstract Object	ObjectInputStream.GetField.get(String name, Object defvalue) Get the value of the named Object field from the persistent field.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.

Methods in java.io with parameters of type Object

boolean	FilePermission.equals(Object obj) Checks two FilePermission objects for equality.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.
abstract Object	ObjectInputStream.GetField.get(String name, Object defvalue) Get the value of the named Object field from the persistent field.
protected void	ObjectOutputStream.writeObjectOverride(Object obj) Method used by subclasses to override the default writeObject method.
void	ObjectOutputStream.writeObject(Object obj) Write the specified object to the ObjectOutputStream.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.
abstract void	ObjectOutputStream.PutField.put(String name, Object value) Put the value of the named Object field into the persistent field.
void	ObjectOutput.writeObject(Object obj) Write an object to the underlying storage or stream.
int	File.compareTo(Object o) Compares this abstract pathname to another object.
boolean	File.equals(Object obj) Tests this abstract pathname for equality with the given object.
int	ObjectStreamField.compareTo(Object o) Compare this field with another ObjectStreamField.
void	PrintWriter.print(Object obj) Print an object.
void	PrintWriter.println(Object x) Print an Object and then terminate the line.
void	PrintStream.print(Object obj) Print an object.
void	PrintStream.println(Object x) Print an Object and then terminate the line.

Constructors in java.io with parameters of type Object

Reader(Object lock)
Create a new character-stream reader whose critical sections will synchronize on the given object.

Writer(Object lock)
Create a new character-stream writer whose critical sections will synchronize on the given object.

Uses of Object in java.lang

Subclasses of Object in java.lang

class	AbstractMethodError Thrown when an application tries to call an abstract method.
class	ArithmeticException Thrown when an exceptional arithmetic condition has occurred.
class	ArrayIndexOutOfBoundsException Thrown to indicate that an array has been accessed with an illegal index.
class	ArrayStoreException Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
class	Boolean The Boolean class wraps a value of the primitive type boolean in an object.
class	Byte The Byte class is the standard wrapper for byte values.
class	Character The Character class wraps a value of the primitive type char in an object.
static class	Character.Subset Instances of this class represent particular subsets of the Unicode character set.
static class	Character.UnicodeBlock A family of character subsets representing the character blocks defined by the Unicode 2.0 specification.
class	Class Instances of the class Class represent classes and interfaces in a running Java application.
class	ClassCastException Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
class	ClassCircularityError Thrown when a circularity has been detected while initializing a class.
class	ClassFormatError Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.
class	ClassLoader The class ClassLoader is an abstract class.
class	ClassNotFoundException Thrown when an application tries to load in a class through its string name using: The forName method in class Class.
class	CloneNotSupportedException Thrown to indicate that the clone method in class Object has been called to clone an object, but that the object's class does not implement the Cloneable interface.
class	Compiler The Compiler class is provided to support Java-to-native-code compilers and related services.
class	Double The Double class wraps a value of the primitive type double in an object.
class	Error An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
class	Exception The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
class	ExceptionInInitializerError Signals that an unexpected exception has occurred in a static initializer.
class	Float The Float class wraps a value of primitive type float in an object.
class	IllegalAccessError Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
class	IllegalAccessException Thrown when an application tries to load in a class, but the currently executing method does not have access to the definition of the specified class, because the class is not public and in another package.
class	IllegalArgumentException Thrown to indicate that a method has been passed an illegal or inappropriate argument.
class	IllegalMonitorStateException Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other threads waiting on an object's monitor without owning the specified monitor.
class	IllegalStateException Signals that a method has been invoked at an illegal or inappropriate time.
class	IllegalThreadStateException Thrown to indicate that a thread is not in an appropriate state for the requested operation.
class	IncompatibleClassChangeError Thrown when an incompatible class change has occurred to some class definition.
class	IndexOutOfBoundsException Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.
class	InheritableThreadLocal This class extends ThreadLocal to provide inheritance of values from parent Thread to child Thread: when a child thread is created, the child receives initial values for all InheritableThreadLocals for which the parent has values.
class	InstantiationError Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.
class	InstantiationException Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class.
class	Integer The Integer class wraps a value of the primitive type int in an object.
class	InternalError Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
class	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise paused for a long time and another thread interrupts it using the interrupt method in class Thread.
class	LinkageError Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.
class	Long The Long class wraps a value of the primitive type long in an object.
class	Math The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoClassDefFoundError Thrown if the Java Virtual Machine or a classloader tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.
class	NoSuchFieldError Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
class	NoSuchFieldException Signals that the class doesn't have a field of a specified name.
class	NoSuchMethodError Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
class	NoSuchMethodException Thrown when a particular method cannot be found.
class	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
class	Number The abstract class Number is the superclass of classes Byte, Double, Float, Integer, Long, and Short.
class	NumberFormatException Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.
class	OutOfMemoryError Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.
class	Package Package objects contain version information about the implementation and specification of a Java package.
class	Process The Runtime.exec methods create a native process and return an instance of a subclass of Process that can be used to control the process and obtain information about it.
class	Runtime Every Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running.
class	RuntimeException RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
class	RuntimePermission This class is for runtime permissions.
class	SecurityException Thrown by the security manager to indicate a security violation.
class	SecurityManager The security manager is a class that allows applications to implement a security policy.
class	Short The Short class is the standard wrapper for short values.
class	StackOverflowError Thrown when a stack overflow occurs because an application recurses too deeply.
class	StrictMath The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	String The String class represents character strings.
class	StringBuffer A string buffer implements a mutable sequence of characters.
class	StringIndexOutOfBoundsException Thrown by the charAt method in class String and by other String methods to indicate that an index is either negative or greater than or equal to the size of the string.
class	System The System class contains several useful class fields and methods.
class	Thread A thread is a thread of execution in a program.
class	ThreadDeath An instance of ThreadDeath is thrown in the victim thread when the stop method with zero arguments in class Thread is called.
class	ThreadGroup A thread group represents a set of threads.
class	ThreadLocal This class provides ThreadLocal variables.
class	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	UnknownError Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
class	UnsatisfiedLinkError Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
class	UnsupportedClassVersionError Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.
class	UnsupportedOperationException Thrown to indicate that the requested operation is not supported.
class	VerifyError Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
class	Void The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the primitive Java type void.

Methods in java.lang that return Object

Object	InheritableThreadLocal.get() Returns the value in the calling thread's copy of this ThreadLocal variable.
protected Object	InheritableThreadLocal.childValue(Object parentValue) Computes the child's initial value for this InheritableThreadLocal as a function of the parent's value at the time the child Thread is created.
Object	SecurityManager.getSecurityContext() Creates an object that encapsulates the current execution environment.
protected Object	ThreadLocal.initialValue() Returns the calling thread's initial value for this ThreadLocal variable.
Object	ThreadLocal.get() Returns the value in the calling thread's copy of this ThreadLocal variable.
Object	Class.newInstance() Creates a new instance of the class represented by this Class object.
Object[]	Class.getSigners() Gets the signers of this class.
protected Object	Object.clone() Creates and returns a copy of this object.
static Object	Compiler.command(Object any) Examines the argument type and its fields and perform some documented operation.

Methods in java.lang with parameters of type Object

static void	System.arraycopy(Object src, int src_position, Object dst, int dst_position, int length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
static void	System.arraycopy(Object src, int src_position, Object dst, int dst_position, int length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
static int	System.identityHashCode(Object x) Returns the same hashcode for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().
boolean	Short.equals(Object obj) Compares this object to the specified object.
int	Short.compareTo(Object o) Compares this Short to another Object.
boolean	Long.equals(Object obj) Compares this object against the specified object.
int	Long.compareTo(Object o) Compares this Long to another Object.
void	InheritableThreadLocal.set(Object value) Sets the calling thread's instance of this ThreadLocal variable to the given value.
protected Object	InheritableThreadLocal.childValue(Object parentValue) Computes the child's initial value for this InheritableThreadLocal as a function of the parent's value at the time the child Thread is created.
boolean	Float.equals(Object obj) Compares this object against some other object.
int	Float.compareTo(Object o) Compares this Float to another Object.
boolean	Double.equals(Object obj) Compares this object against the specified object.
int	Double.compareTo(Object o) Compares this Double to another Object.
boolean	Character.equals(Object obj) Compares this object against the specified object.
int	Character.compareTo(Object o) Compares this Character to another Object.
boolean	Character.Subset.equals(Object obj) Compares two Subset objects for equality.
boolean	Byte.equals(Object obj) Compares this object to the specified object.
int	Byte.compareTo(Object o) Compares this Byte to another Object.
boolean	Boolean.equals(Object obj) Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.
boolean	Integer.equals(Object obj) Compares this object to the specified object.
int	Integer.compareTo(Object o) Compares this Integer to another Object.
void	SecurityManager.checkPermission(Permission perm, Object context) Throws a SecurityException if the specified security context is denied access to the resource specified by the given permission.
void	SecurityManager.checkRead(String file, Object context) Throws a SecurityException if the specified security context is not allowed to read the file specified by the string argument.
void	SecurityManager.checkConnect(String host, int port, Object context) Throws a SecurityException if the specified security context is not allowed to open a socket connection to the specified host and port number.
boolean	SecurityManager.checkTopLevelWindow(Object window) Returns false if the calling thread is not trusted to bring up the top-level window indicated by the window argument, or the AWT package is not available.
StringBuffer	StringBuffer.append(Object obj) Appends the string representation of the Object argument to this string buffer.
StringBuffer	StringBuffer.insert(int offset, Object obj) Inserts the string representation of the Object argument into this string buffer.
void	ThreadLocal.set(Object value) Sets the calling thread's instance of this ThreadLocal variable to the given value.
protected void	ClassLoader.setSigners(Class c, Object[] signers) Sets the signers of a class.
int	Comparable.compareTo(Object o) Compares this object with the specified object for order.
boolean	String.equals(Object anObject) Compares this string to the specified object.
int	String.compareTo(Object o) Compares this String to another Object.
static String	String.valueOf(Object obj) Returns the string representation of the Object argument.
boolean	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.
boolean	Object.equals(Object obj) Indicates whether some other object is "equal to" this one.
static Object	Compiler.command(Object any) Examines the argument type and its fields and perform some documented operation.

Uses of Object in java.lang.ref

Subclasses of Object in java.lang.ref

class	PhantomReference Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
class	Reference Abstract base class for reference objects.
class	ReferenceQueue Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
class	SoftReference Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
class	WeakReference Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.

Methods in java.lang.ref that return Object

Object	PhantomReference.get() Returns this reference object's referent.
Object	Reference.get() Returns this reference object's referent.
Object	SoftReference.get() Returns this reference object's referent.

Constructors in java.lang.ref with parameters of type Object

WeakReference(Object referent)
Creates a new weak reference that refers to the given object.

WeakReference(Object referent, ReferenceQueue q)
Creates a new weak reference that refers to the given object and is registered with the given queue.

PhantomReference(Object referent, ReferenceQueue q)
Creates a new phantom reference that refers to the given object and is registered with the given queue.

SoftReference(Object referent)
Creates a new soft reference that refers to the given object.

SoftReference(Object referent, ReferenceQueue q)
Creates a new soft reference that refers to the given object and is registered with the given queue.

Uses of Object in java.lang.reflect

Subclasses of Object in java.lang.reflect

class	AccessibleObject The AccessibleObject class is the base class for Field, Method and Constructor objects.
class	Array The Array class provides static methods to dynamically create and access Java arrays.
class	Constructor Constructor provides information about, and access to, a single constructor for a class.
class	Field A Field provides information about, and dynamic access to, a single field of a class or an interface.
class	InvocationTargetException InvocationTargetException is a checked exception that wraps an exception thrown by an invoked method or constructor.
class	Method A Method provides information about, and access to, a single method on a class or interface.
class	Modifier The Modifier class provides static methods and constants to decode class and member access modifiers.
class	Proxy Proxy provides static methods for creating dynamic proxy classes and instances, and it is also the superclass of all dynamic proxy classes created by those methods.
class	ReflectPermission The Permission class for reflective operations.
class	UndeclaredThrowableException Thrown by a method invocation on a proxy instance if its invocation handler's invoke method throws a checked exception (a Throwable that is not assignable to RuntimeException or Error) that is not assignable to any of the exception types declared in the throws clause of the method that was invoked on the proxy instance and dispatched to the invocation handler.

Methods in java.lang.reflect that return Object

static Object	Proxy.newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h) Returns an instance of a proxy class for the specified interfaces that dispatches method invocations to the specified invocation handler.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
static Object	Array.newInstance(Class componentType, int length) Creates a new array with the specified component type and length.
static Object	Array.newInstance(Class componentType, int[] dimensions) Creates a new array with the specified component type and dimensions.
static Object	Array.get(Object array, int index) Returns the value of the indexed component in the specified array object.
Object	Constructor.newInstance(Object[] initargs) Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.
Object	Method.invoke(Object obj, Object[] args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
Object	Field.get(Object obj) Returns the value of the field represented by this Field, on the specified object.

Methods in java.lang.reflect with parameters of type Object

static InvocationHandler	Proxy.getInvocationHandler(Object proxy) Returns the invocation handler for the specified proxy instance.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
static int	Array.getLength(Object array) Returns the length of the specified array object, as an int.
static Object	Array.get(Object array, int index) Returns the value of the indexed component in the specified array object.
static boolean	Array.getBoolean(Object array, int index) Returns the value of the indexed component in the specified array object, as a boolean.
static byte	Array.getByte(Object array, int index) Returns the value of the indexed component in the specified array object, as a byte.
static char	Array.getChar(Object array, int index) Returns the value of the indexed component in the specified array object, as a char.
static short	Array.getShort(Object array, int index) Returns the value of the indexed component in the specified array object, as a short.
static int	Array.getInt(Object array, int index) Returns the value of the indexed component in the specified array object, as an int.
static long	Array.getLong(Object array, int index) Returns the value of the indexed component in the specified array object, as a long.
static float	Array.getFloat(Object array, int index) Returns the value of the indexed component in the specified array object, as a float.
static double	Array.getDouble(Object array, int index) Returns the value of the indexed component in the specified array object, as a double.
static void	Array.set(Object array, int index, Object value) Sets the value of the indexed component of the specified array object to the specified new value.
static void	Array.set(Object array, int index, Object value) Sets the value of the indexed component of the specified array object to the specified new value.
static void	Array.setBoolean(Object array, int index, boolean z) Sets the value of the indexed component of the specified array object to the specified boolean value.
static void	Array.setByte(Object array, int index, byte b) Sets the value of the indexed component of the specified array object to the specified boolean value.
static void	Array.setChar(Object array, int index, char c) Sets the value of the indexed component of the specified array object to the specified byte value.
static void	Array.setShort(Object array, int index, short s) Sets the value of the indexed component of the specified array object to the specified short value.
static void	Array.setInt(Object array, int index, int i) Sets the value of the indexed component of the specified array object to the specified int value.
static void	Array.setLong(Object array, int index, long l) Sets the value of the indexed component of the specified array object to the specified long value.
static void	Array.setFloat(Object array, int index, float f) Sets the value of the indexed component of the specified array object to the specified float value.
static void	Array.setDouble(Object array, int index, double d) Sets the value of the indexed component of the specified array object to the specified double value.
boolean	Constructor.equals(Object obj) Compares this Constructor against the specified object.
Object	Constructor.newInstance(Object[] initargs) Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.
boolean	Method.equals(Object obj) Compares this Method against the specified object.
Object	Method.invoke(Object obj, Object[] args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
Object	Method.invoke(Object obj, Object[] args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
boolean	Field.equals(Object obj) Compares this Field against the specified object.
Object	Field.get(Object obj) Returns the value of the field represented by this Field, on the specified object.
boolean	Field.getBoolean(Object obj) Gets the value of a field as a boolean on the specified object.
byte	Field.getByte(Object obj) Gets the value of a field as a byte on the specified object.
char	Field.getChar(Object obj) Gets the value of a field as a char on the specified object.
short	Field.getShort(Object obj) Gets the value of a field as a short on the specified object.
int	Field.getInt(Object obj) Gets the value of a field as an int on the specified object.
long	Field.getLong(Object obj) Gets the value of a field as a long on the specified object.
float	Field.getFloat(Object obj) Gets the value of a field as a float on the specified object.
double	Field.getDouble(Object obj) Gets the value of a field as a double on the specified object.
void	Field.set(Object obj, Object value) Sets the field represented by this Field object on the specified object argument to the specified new value.
void	Field.set(Object obj, Object value) Sets the field represented by this Field object on the specified object argument to the specified new value.
void	Field.setBoolean(Object obj, boolean z) Sets the value of a field as a boolean on the specified object.
void	Field.setByte(Object obj, byte b) Sets the value of a field as a byte on the specified object.
void	Field.setChar(Object obj, char c) Sets the value of a field as a char on the specified object.
void	Field.setShort(Object obj, short s) Sets the value of a field as a short on the specified object.
void	Field.setInt(Object obj, int i) Sets the value of a field as an int on the specified object.
void	Field.setLong(Object obj, long l) Sets the value of a field as a long on the specified object.
void	Field.setFloat(Object obj, float f) Sets the value of a field as a float on the specified object.
void	Field.setDouble(Object obj, double d) Sets the value of a field as a double on the specified object.

Uses of Object in java.math

Subclasses of Object in java.math

class	BigDecimal Immutable, arbitrary-precision signed decimal numbers.
class	BigInteger Immutable arbitrary-precision integers.

Methods in java.math with parameters of type Object

int	BigDecimal.compareTo(Object o) Compares this BigDecimal with the specified Object.
boolean	BigDecimal.equals(Object x) Compares this BigDecimal with the specified Object for equality.
int	BigInteger.compareTo(Object o) Compares this BigInteger with the specified Object.
boolean	BigInteger.equals(Object x) Compares this BigInteger with the specified Object for equality.

Uses of Object in java.net

Subclasses of Object in java.net

class	Authenticator The class Authenticator represents an object that knows how to obtain authentication for a network connection.
class	BindException Signals that an error occurred while attempting to bind a socket to a local address and port.
class	ConnectException Signals that an error occurred while attempting to connect a socket to a remote address and port.
class	ContentHandler The abstract class ContentHandler is the superclass of all classes that read an Object from a URLConnection.
class	DatagramPacket This class represents a datagram packet.
class	DatagramSocket This class represents a socket for sending and receiving datagram packets.
class	DatagramSocketImpl Abstract datagram and multicast socket implementation base class.
class	HttpURLConnection A URLConnection with support for HTTP-specific features.
class	InetAddress This class represents an Internet Protocol (IP) address.
class	JarURLConnection A URL Connection to a Java ARchive (JAR) file or an entry in a JAR file.
class	MalformedURLException Thrown to indicate that a malformed URL has occurred.
class	MulticastSocket The multicast datagram socket class is useful for sending and receiving IP multicast packets.
class	NetPermission This class is for various network permissions.
class	NoRouteToHostException Signals that an error occurred while attempting to connect a socket to a remote address and port.
class	PasswordAuthentication The class PasswordAuthentication is a data holder that is used by Authenticator.
class	ProtocolException Thrown to indicate that there is an error in the underlying protocol, such as a TCP error.
class	ServerSocket This class implements server sockets.
class	Socket This class implements client sockets (also called just "sockets").
class	SocketException Thrown to indicate that there is an error in the underlying protocol, such as a TCP error.
class	SocketImpl The abstract class SocketImpl is a common superclass of all classes that actually implement sockets.
class	SocketPermission This class represents access to a network via sockets.
class	UnknownHostException Thrown to indicate that the IP address of a host could not be determined.
class	UnknownServiceException Thrown to indicate that an unknown service exception has occurred.
class	URL Class URL represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web.
class	URLClassLoader This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories.
class	URLConnection The abstract class URLConnection is the superclass of all classes that represent a communications link between the application and a URL.
class	URLDecoder The class contains a utility method for converting from a MIME format called "x-www-form-urlencoded" to a String
class	URLEncoder The class contains a utility method for converting a String into a MIME format called "x-www-form-urlencoded" format.
class	URLStreamHandler The abstract class URLStreamHandler is the common superclass for all stream protocol handlers.

Methods in java.net that return Object

abstract Object	ContentHandler.getContent(URLConnection urlc) Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object from it.
Object	ContentHandler.getContent(URLConnection urlc, Class[] classes) Given a URL connect stream positioned at the beginning of the representation of an object, this method reads that stream and creates an object that matches one of the types specified.
Object	URLConnection.getContent() Retrieves the contents of this URL connection.
Object	URLConnection.getContent(Class[] classes) Retrieves the contents of this URL connection.
Object	URL.getContent() Returns the contents of this URL.
Object	URL.getContent(Class[] classes) Returns the contents of this URL.
Object	SocketOptions.getOption(int optID) Fetch the value of an option.

Methods in java.net with parameters of type Object

boolean	SocketPermission.equals(Object obj) Checks two SocketPermission objects for equality.
boolean	InetAddress.equals(Object obj) Compares this object against the specified object.
boolean	URL.equals(Object obj) Compares two URLs.
void	SocketOptions.setOption(int optID, Object value) Enable/disable the option specified by optID.

Uses of Object in java.rmi

Subclasses of Object in java.rmi

class	AccessException An AccessException is thrown to indicate that the caller does not have permission to perform the action requested by the method call.
class	AlreadyBoundException An AlreadyBoundException is thrown if an attempt is made to bind an object in the registry to a name that already has an associated binding.
class	NotBoundException A NotBoundException is thrown if an attempt is made to lookup or unbind in the registry a name that has no associated binding.
class	RemoteException A RemoteException is the common superclass for a number of communication-related exceptions that may occur during the execution of a remote method call.
class	UnexpectedException An UnexpectedException is thrown if the client of a remote method call receives, as a result of the call, a checked exception that is not among the checked exception types declared in the throws clause of the method in the remote interface.

Uses of Object in java.security

Subclasses of Object in java.security

class	AccessControlContext An AccessControlContext is used to make system resource access decisions based on the context it encapsulates.
class	AccessControlException This exception is thrown by the AccessController to indicate that a requested access (to a critical system resource such as the file system or the network) is denied.
class	AccessController The AccessController class is used for three purposes: to decide whether an access to a critical system resource is to be allowed or denied, based on the security policy currently in effect,
class	AlgorithmParameterGenerator The AlgorithmParameterGenerator class is used to generate a set of parameters to be used with a certain algorithm.
class	AlgorithmParameterGeneratorSpi This class defines the Service Provider Interface (SPI) for the AlgorithmParameterGenerator class, which is used to generate a set of parameters to be used with a certain algorithm.
class	AlgorithmParameters This class is used as an opaque representation of cryptographic parameters.
class	AlgorithmParametersSpi This class defines the Service Provider Interface (SPI) for the AlgorithmParameters class, which is used to manage algorithm parameters.
class	AllPermission The AllPermission is a permission that implies all other permissions.
class	BasicPermission The BasicPermission class extends the Permission class, and can be used as the base class for permissions that want to follow the same naming convention as BasicPermission.
class	CodeSource This class extends the concept of a codebase to encapsulate not only the location (URL) but also the certificate(s) that were used to verify signed code originating from that location.
class	DigestException This is the generic Message Digest exception.
class	DigestInputStream A transparent stream that updates the associated message digest using the bits going through the stream.
class	DigestOutputStream A transparent stream that updates the associated message digest using the bits going through the stream.
class	GeneralSecurityException This is the general security exception class, which serves to group all the exception classes of the java.security package that extend from it.
class	GuardedObject A GuardedObject is an object that is used to protect access to another object.
class	Identity Deprecated. This class is no longer used. Its functionality has been replaced by java.security.KeyStore, the java.security.cert package, and java.security.Principal.
class	IdentityScope Deprecated. This class is no longer used. Its functionality has been replaced by java.security.KeyStore, the java.security.cert package, and java.security.Principal.
class	InvalidAlgorithmParameterException This is the exception for invalid or inappropriate algorithm parameters.
class	InvalidKeyException This is the exception for invalid Keys (invalid encoding, wrong length, uninitialized, etc).
class	InvalidParameterException This exception is thrown when an invalid parameter is passed to a method.
class	KeyException This is the basic key exception.
class	KeyFactory Key factories are used to convert keys (opaque cryptographic keys of type Key) into key specifications (transparent representations of the underlying key material), and vice versa.
class	KeyFactorySpi This class defines the Service Provider Interface (SPI) for the KeyFactory class.
class	KeyManagementException This is the general key management exception, for all operations dealing with key management.
class	KeyPair This class is a simple holder for a key pair (a public key and a private key).
class	KeyPairGenerator The KeyPairGenerator class is used to generate pairs of public and private keys.
class	KeyPairGeneratorSpi This class defines the Service Provider Interface (SPI) for the KeyPairGenerator class, which is used to generate pairs of public and private keys.
class	KeyStore This class represents an in-memory collection of keys and certificates.
class	KeyStoreException This is the generic KeyStore exception.
class	KeyStoreSpi This class defines the Service Provider Interface (SPI) for the KeyStore class.
class	MessageDigest This MessageDigest class provides applications the functionality of a message digest algorithm, such as MD5 or SHA.
class	MessageDigestSpi This class defines the Service Provider Interface (SPI) for the MessageDigest class, which provides the functionality of a message digest algorithm, such as MD5 or SHA.
class	NoSuchAlgorithmException This exception is thrown when a particular cryptographic algorithm is requested but is not available in the environment.
class	NoSuchProviderException This exception is thrown when a particular security provider is requested but is not available in the environment.
class	Permission Abstract class for representing access to a system resource.
class	PermissionCollection Abstract class representing a collection of Permission objects.
class	Permissions This class represents a heterogeneous collection of Permissions.
class	Policy This is an abstract class for representing the system security policy for a Java application environment (specifying which permissions are available for code from various sources).
class	PrivilegedActionException This exception is thrown by doPrivileged(PrivilegedExceptionAction) and doPrivileged(PrivilegedExceptionAction, AccessControlContext context) to indicate that the action being performed threw a checked exception.
class	ProtectionDomain This ProtectionDomain class encapulates the characteristics of a domain, which encloses a set of classes whose instances are granted the same set of permissions.
class	Provider This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security, including: Algorithms (such as DSA, RSA, MD5 or SHA-1).
class	ProviderException A runtime exception for Provider exceptions (such as misconfiguration errors), which may be subclassed by Providers to throw specialized, provider-specific runtime errors.
class	SecureClassLoader This class extends ClassLoader with additional support for defining classes with an associated code source and permissions which are retrieved by the system policy by default.
class	SecureRandom This class provides a cryptographically strong pseudo-random number generator (PRNG).
class	SecureRandomSpi This class defines the Service Provider Interface (SPI) for the SecureRandom class.
class	Security This class centralizes all security properties and common security methods.
class	SecurityPermission This class is for security permissions.
class	Signature This Signature class is used to provide applications the functionality of a digital signature algorithm.
class	SignatureException This is the generic Signature exception.
class	SignatureSpi This class defines the Service Provider Interface (SPI) for the Signature class, which is used to provide the functionality of a digital signature algorithm.
class	SignedObject SignedObject is a class for the purpose of creating authentic runtime objects whose integrity cannot be compromised without being detected.
class	Signer Deprecated. This class is no longer used. Its functionality has been replaced by java.security.KeyStore, the java.security.cert package, and java.security.Principal.
class	UnrecoverableKeyException This exception is thrown if a key in the keystore cannot be recovered.
class	UnresolvedPermission The UnresolvedPermission class is used to hold Permissions that were "unresolved" when the Policy was initialized.

Methods in java.security that return Object

Object	GuardedObject.getObject() Retrieves the guarded object, or throws an exception if access to the guarded object is denied by the guard.
Object	PrivilegedExceptionAction.run() Performs the computation.
Object	PrivilegedAction.run() Performs the computation.
static Object	AccessController.doPrivileged(PrivilegedAction action) Performs the specified PrivilegedAction with privileges enabled.
static Object	AccessController.doPrivileged(PrivilegedAction action, AccessControlContext context) Performs the specified PrivilegedAction with privileges enabled and restricted by the specified AccessControlContext.
static Object	AccessController.doPrivileged(PrivilegedExceptionAction action) Performs the specified PrivilegedExceptionAction with privileges enabled.
static Object	AccessController.doPrivileged(PrivilegedExceptionAction action, AccessControlContext context) Performs the specified PrivilegedExceptionAction with privileges enabled and restricted by the specified AccessControlContext.
Object	Provider.put(Object key, Object value) Sets the key property to have the specified value.
Object	Provider.remove(Object key) Removes the key property (and its corresponding value).
Object	MessageDigestSpi.clone() Returns a clone if the implementation is cloneable.
Object	MessageDigest.clone() Returns a clone if the implementation is cloneable.
Object	SignedObject.getObject() Retrieves the encapsulated object.
Object	SignatureSpi.clone() Returns a clone if the implementation is cloneable.
Object	Signature.clone() Returns a clone if the implementation is cloneable.

Methods in java.security with parameters of type Object

boolean	UnresolvedPermission.equals(Object obj) Checks two UnresolvedPermission objects for equality.
Object	Provider.put(Object key, Object value) Sets the key property to have the specified value.
Object	Provider.put(Object key, Object value) Sets the key property to have the specified value.
Object	Provider.remove(Object key) Removes the key property (and its corresponding value).
boolean	AccessControlContext.equals(Object obj) Checks two AccessControlContext objects for equality.
boolean	AllPermission.equals(Object obj) Checks two AllPermission objects for equality.
boolean	CodeSource.equals(Object obj) Tests for equality between the specified object and this object.
void	Guard.checkGuard(Object object) Determines whether or not to allow access to the guarded object object.
void	Permission.checkGuard(Object object) Implements the guard interface for a permission.
abstract boolean	Permission.equals(Object obj) Checks two Permission objects for equality.
boolean	BasicPermission.equals(Object obj) Checks two BasicPermission objects for equality.
boolean	Principal.equals(Object another) Compares this principal to the specified object.
boolean	Identity.equals(Object identity) Deprecated. Tests for equality between the specified object and this identity.

Constructors in java.security with parameters of type Object

GuardedObject(Object object, Guard guard)
Constructs a GuardedObject using the specified object and guard.

Uses of Object in java.security.acl

Subclasses of Object in java.security.acl

class	AclNotFoundException This is an exception that is thrown whenever a reference is made to a non-existent ACL (Access Control List).
class	LastOwnerException This is an exception that is thrown whenever an attempt is made to delete the last owner of an Access Control List.
class	NotOwnerException This is an exception that is thrown whenever the modification of an object (such as an Access Control List) is only allowed to be done by an owner of the object, but the Principal attempting the modification is not an owner.

Methods in java.security.acl that return Object

Object

AclEntry.clone() Clones this ACL entry.

Methods in java.security.acl with parameters of type Object

boolean

Permission.equals(Object another) Returns true if the object passed matches the permission represented in this interface.

Uses of Object in java.security.cert

Subclasses of Object in java.security.cert

class	Certificate Abstract class for managing a variety of identity certificates.
protected static class	Certificate.CertificateRep Alternate Certificate class for serialization.
class	CertificateEncodingException Certificate Encoding Exception.
class	CertificateException This exception indicates one of a variety of certificate problems.
class	CertificateExpiredException Certificate Expired Exception.
class	CertificateFactory This class defines the functionality of a certificate factory, which is used to generate certificate and certificate revocation list (CRL) objects from their encodings.
class	CertificateFactorySpi This class defines the Service Provider Interface (SPI) for the CertificateFactory class.
class	CertificateNotYetValidException Certificate is not yet valid exception.
class	CertificateParsingException Certificate Parsing Exception.
class	CRL This class is an abstraction of certificate revocation lists (CRLs) that have different formats but important common uses.
class	CRLException CRL (Certificate Revocation List) Exception
class	X509Certificate Abstract class for X.509 certificates.
class	X509CRL Abstract class for an X.509 Certificate Revocation List (CRL).
class	X509CRLEntry Abstract class for a revoked certificate in a CRL (Certificate Revocation List).

Methods in java.security.cert that return Object

protected Object	Certificate.writeReplace() Replace the Certificate to be serialized.
protected Object	Certificate.CertificateRep.readResolve() Resolve the Certificate Object.

Methods in java.security.cert with parameters of type Object

boolean	Certificate.equals(Object other) Compares this certificate for equality with the specified object.
boolean	X509CRLEntry.equals(Object other) Compares this CRL entry for equality with the given object.
boolean	X509CRL.equals(Object other) Compares this CRL for equality with the given object.

Uses of Object in java.security.spec

Subclasses of Object in java.security.spec

class	DSAParameterSpec This class specifies the set of parameters used with the DSA algorithm.
class	DSAPrivateKeySpec This class specifies a DSA private key with its associated parameters.
class	DSAPublicKeySpec This class specifies a DSA public key with its associated parameters.
class	EncodedKeySpec This class represents a public or private key in encoded format.
class	InvalidKeySpecException This is the exception for invalid key specifications.
class	InvalidParameterSpecException This is the exception for invalid parameter specifications.
class	PKCS8EncodedKeySpec This class represents the ASN.1 encoding of a private key, encoded according to the ASN.1 type PrivateKeyInfo, whose syntax is defined in the PKCS#8 standard, as follows:
class	RSAKeyGenParameterSpec This class specifies the set of parameters used to generate an RSA key pair.
class	RSAPrivateCrtKeySpec This class specifies an RSA private key, as defined in the PKCS#1 standard, using the Chinese Remainder Theorem (CRT) information values for efficiency.
class	RSAPrivateKeySpec This class specifies an RSA private key.
class	RSAPublicKeySpec This class specifies an RSA public key.
class	X509EncodedKeySpec This class represents the ASN.1 encoding of a public key, encoded according to the ASN.1 type SubjectPublicKeyInfo, whose syntax is defined in the X.509 standard, as follows:

Uses of Object in java.text

Subclasses of Object in java.text

class	Annotation An Annotation object is used as a wrapper for a text attribute value if the attribute has annotation characteristics.
static class	AttributedCharacterIterator.Attribute Defines attribute keys that are used to identify text attributes.
class	AttributedString An AttributedString holds text and related attribute information.
class	BreakIterator The BreakIterator class implements methods for finding the location of boundaries in text.
class	ChoiceFormat A ChoiceFormat allows you to attach a format to a range of numbers.
class	CollationElementIterator The CollationElementIterator class is used as an iterator to walk through each character of an international string.
class	CollationKey A CollationKey represents a String under the rules of a specific Collator object.
class	Collator The Collator class performs locale-sensitive String comparison.
class	DateFormat DateFormat is an abstract class for date/time formatting subclasses which formats and parses dates or time in a language-independent manner.
class	DateFormatSymbols DateFormatSymbols is a public class for encapsulating localizable date-time formatting data, such as the names of the months, the names of the days of the week, and the time zone data.
class	DecimalFormat DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers.
class	DecimalFormatSymbols This class represents the set of symbols (such as the decimal separator, the grouping separator, and so on) needed by DecimalFormat to format numbers.
class	FieldPosition FieldPosition is a simple class used by Format and its subclasses to identify fields in formatted output.
class	Format Format is an abstract base class for formatting locale-sensitive information such as dates, messages, and numbers.
class	MessageFormat MessageFormat provides a means to produce concatenated messages in language-neutral way.
class	NumberFormat NumberFormat is the abstract base class for all number formats.
class	ParseException Signals that an error has been reached unexpectedly while parsing.
class	ParsePosition ParsePosition is a simple class used by Format and its subclasses to keep track of the current position during parsing.
class	RuleBasedCollator The RuleBasedCollator class is a concrete subclass of Collator that provides a simple, data-driven, table collator.
class	SimpleDateFormat SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner.
class	StringCharacterIterator StringCharacterIterator implements the CharacterIterater protocol for a String.

Methods in java.text that return Object

Object	SimpleDateFormat.clone() Overrides Cloneable
Object	DecimalFormatSymbols.clone() Standard override.
Object	DecimalFormat.clone() Standard override; no change in semantics.
Object	DateFormatSymbols.clone() Overrides Cloneable
Object	DateFormat.parseObject(String source, ParsePosition pos) Parse a date/time string into an Object.
Object	DateFormat.clone() Overrides Cloneable
Object[]	ChoiceFormat.getFormats() Get the formats passed in the constructor.
Object	ChoiceFormat.clone() Overrides Cloneable
Object	NumberFormat.parseObject(String source, ParsePosition parsePosition) Parses a string to produce an object.
Object	NumberFormat.clone() Overrides Cloneable
abstract Object	Format.parseObject(String source, ParsePosition status) Parses a string to produce an object.
Object	Format.parseObject(String source) Parses a string to produce an object.
Object	Format.clone() Overrides Cloneable
Object[]	MessageFormat.parse(String source, ParsePosition status) Parses the string.
Object[]	MessageFormat.parse(String source) Parses the string.
Object	MessageFormat.parseObject(String text, ParsePosition status) Parses the string.
Object	MessageFormat.clone() Overrides Cloneable
Object	StringCharacterIterator.clone() Creates a copy of this iterator.
Object	Collator.clone() Overrides Cloneable
Object	RuleBasedCollator.clone() Standard override; no change in semantics.
Object	BreakIterator.clone() Create a copy of this iterator
Object	CharacterIterator.clone() Create a copy of this iterator
Object	AttributedCharacterIterator.getAttribute(AttributedCharacterIterator.Attribute attribute) Returns the value of the named attribute for the current character.
protected Object	AttributedCharacterIterator.Attribute.readResolve() Resolves instances being deserialized to the predefined constants.
Object	Annotation.getValue() Returns the value of the attribute, which may be null.

Methods in java.text with parameters of type Object

boolean	SimpleDateFormat.equals(Object obj) Override equals.
boolean	DecimalFormatSymbols.equals(Object obj) Override equals.
boolean	DecimalFormat.equals(Object obj) Overrides equals
boolean	DateFormatSymbols.equals(Object obj) Override equals
StringBuffer	DateFormat.format(Object obj, StringBuffer toAppendTo, FieldPosition fieldPosition) Overrides Format.
boolean	DateFormat.equals(Object obj) Overrides equals
boolean	ChoiceFormat.equals(Object obj) Equality comparision between two
StringBuffer	NumberFormat.format(Object number, StringBuffer toAppendTo, FieldPosition pos) Formats an object to produce a string.
boolean	NumberFormat.equals(Object obj) Overrides equals
boolean	ParsePosition.equals(Object obj) Overrides equals
boolean	FieldPosition.equals(Object obj) Overrides equals
String	Format.format(Object obj) Formats an object to produce a string.
abstract StringBuffer	Format.format(Object obj, StringBuffer toAppendTo, FieldPosition pos) Formats an object to produce a string.
StringBuffer	MessageFormat.format(Object[] source, StringBuffer result, FieldPosition ignore) Returns pattern with formatted objects.
static String	MessageFormat.format(String pattern, Object[] arguments) Convenience routine.
StringBuffer	MessageFormat.format(Object source, StringBuffer result, FieldPosition ignore) Returns pattern with formatted objects.
boolean	MessageFormat.equals(Object obj) Equality comparision between two message format objects
boolean	StringCharacterIterator.equals(Object obj) Compares the equality of two StringCharacterIterator objects.
int	CollationKey.compareTo(Object o) Compares this CollationKey with the specified Object for order.
boolean	CollationKey.equals(Object target) Compare this CollationKey and the target CollationKey for equality.
int	Collator.compare(Object o1, Object o2) Compares its two arguments for order.
int	Collator.compare(Object o1, Object o2) Compares its two arguments for order.
boolean	Collator.equals(Object that) Compares the equality of two Collators.
boolean	RuleBasedCollator.equals(Object obj) Compares the equality of two collation objects.
void	AttributedString.addAttribute(AttributedCharacterIterator.Attribute attribute, Object value) Adds an attribute to the entire string.
void	AttributedString.addAttribute(AttributedCharacterIterator.Attribute attribute, Object value, int beginIndex, int endIndex) Adds an attribute to a subrange of the string.
boolean	AttributedCharacterIterator.Attribute.equals(Object obj) Compares two objects for equality.

Constructors in java.text with parameters of type Object

Annotation(Object value)
Constructs an annotation record with the given value, which may be null.

Uses of Object in java.util

Subclasses of Object in java.util

class	AbstractCollection This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
class	AbstractList This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
class	AbstractMap This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
class	AbstractSequentialList This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).
class	AbstractSet This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
class	ArrayList Resizable-array implementation of the List interface.
class	Arrays This class contains various methods for manipulating arrays (such as sorting and searching).
class	BitSet This class implements a vector of bits that grows as needed.
class	Calendar Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.
class	Collections This class consists exclusively of static methods that operate on or return collections.
class	ConcurrentModificationException This exception may be thrown by methods that have detected concurrent modification of a backing object when such modification is not permissible.
class	Date The class Date represents a specific instant in time, with millisecond precision.
class	Dictionary The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	EventObject The root class from which all event state objects shall be derived.
class	GregorianCalendar GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar used by most of the world.
class	HashMap Hash table based implementation of the Map interface.
class	HashSet This class implements the Set interface, backed by a hash table (actually a HashMap instance).
class	Hashtable This class implements a hashtable, which maps keys to values.
class	LinkedList Linked list implementation of the List interface.
class	ListResourceBundle ListResourceBundle is a abstract subclass of ResourceBundle that manages resources for a locale in a convenient and easy to use list.
class	Locale A Locale object represents a specific geographical, political, or cultural region.
class	MissingResourceException Signals that a resource is missing.
class	NoSuchElementException Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.
class	Observable This class represents an observable object, or "data" in the model-view paradigm.
class	Properties The Properties class represents a persistent set of properties.
class	PropertyPermission This class is for property permissions.
class	PropertyResourceBundle PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a locale using a set of static strings from a property file.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers.
class	ResourceBundle Resource bundles contain locale-specific objects.
class	SimpleTimeZone SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.
class	Stack The Stack class represents a last-in-first-out (LIFO) stack of objects.
class	StringTokenizer The string tokenizer class allows an application to break a string into tokens.
class	Timer A facility for threads to schedule tasks for future execution in a background thread.
class	TimerTask A task that can be scheduled for one-time or repeated execution by a Timer.
class	TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
class	TooManyListenersException The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.
class	TreeMap Red-Black tree based implementation of the SortedMap interface.
class	TreeSet This class implements the Set interface, backed by a TreeMap instance.
class	Vector The Vector class implements a growable array of objects.
class	WeakHashMap A hashtable-based Map implementation with weak keys.

Fields in java.util declared as Object

protected Object[]	Vector.elementData The array buffer into which the components of the vector are stored.
protected Object	EventObject.source The object on which the Event initially occurred.

Methods in java.util that return Object

Object	WeakHashMap.get(Object key) Returns the value to which this map maps the specified key.
Object	WeakHashMap.put(Object key, Object value) Updates this map so that the given key maps to the given value.
Object	WeakHashMap.remove(Object key) Removes the mapping for the given key from this map, if present.
Object	StringTokenizer.nextElement() Returns the same value as the nextToken method, except that its declared return value is Object rather than String.
Object	PropertyResourceBundle.handleGetObject(String key) Override of ResourceBundle, same semantics
Object	LinkedList.getFirst() Returns the first element in this list.
Object	LinkedList.getLast() Returns the last element in this list.
Object	LinkedList.removeFirst() Removes and returns the first element from this list.
Object	LinkedList.removeLast() Removes and returns the last element from this list.
Object	LinkedList.get(int index) Returns the element at the specified position in this list.
Object	LinkedList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
Object	LinkedList.remove(int index) Removes the element at the specified position in this list.
Object	LinkedList.clone() Returns a shallow copy of this LinkedList.
Object[]	LinkedList.toArray() Returns an array containing all of the elements in this list in the correct order.
Object[]	LinkedList.toArray(Object[] a) Returns an array containing all of the elements in this list in the correct order.
Object	SortedMap.firstKey() Returns the first (lowest) key currently in this sorted map.
Object	SortedMap.lastKey() Returns the last (highest) key currently in this sorted map.
static Object	Collections.min(Collection coll) Returns the minimum element of the given collection, according to the natural ordering of its elements.
static Object	Collections.min(Collection coll, Comparator comp) Returns the minimum element of the given collection, according to the order induced by the specified comparator.
static Object	Collections.max(Collection coll) Returns the maximum element of the given collection, according to the natural ordering of its elements.
static Object	Collections.max(Collection coll, Comparator comp) Returns the maximum element of the given collection, according to the order induced by the specified comparator.
Object	SortedSet.first() Returns the first (lowest) element currently in this sorted set.
Object	SortedSet.last() Returns the last (highest) element currently in this sorted set.
Object	BitSet.clone() Cloning this BitSet produces a new BitSet that is equal to it.
Object	AbstractSequentialList.get(int index) Returns the element at the specified position in this list.
Object	AbstractSequentialList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
Object	AbstractSequentialList.remove(int index) Removes the element at the specified position in this list.
Object	SimpleTimeZone.clone() Overrides Cloneable
Object	TimeZone.clone() Overrides Cloneable
Object	Date.clone() Return a copy of this object.
Object	Calendar.clone() Overrides Cloneable
Object	Properties.setProperty(String key, String value) Calls the hashtable method put.
Object	HashSet.clone() Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
Object	ArrayList.clone() Returns a shallow copy of this ArrayList instance.
Object[]	ArrayList.toArray() Returns an array containing all of the elements in this list in the correct order.
Object[]	ArrayList.toArray(Object[] a) Returns an array containing all of the elements in this list in the correct order.
Object	ArrayList.get(int index) Returns the element at the specified position in this list.
Object	ArrayList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
Object	ArrayList.remove(int index) Removes the element at the specified position in this list.
Object	ListIterator.next() Returns the next element in the list.
Object	ListIterator.previous() Returns the previous element in the list.
Object	Iterator.next() Returns the next element in the interation.
Object	ResourceBundle.getObject(String key) Get an object from a ResourceBundle.
protected abstract Object	ResourceBundle.handleGetObject(String key) Get an object from a ResourceBundle.
Object	Enumeration.nextElement() Returns the next element of this enumeration if this enumeration object has at least one more element to provide.
Object	AbstractMap.get(Object key) Returns the value to which this map maps the specified key.
Object	AbstractMap.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	AbstractMap.remove(Object key) Removes the mapping for this key from this map if present (optional operation).
Object	Stack.push(Object item) Pushes an item onto the top of this stack.
Object	Stack.pop() Removes the object at the top of this stack and returns that object as the value of this function.
Object	Stack.peek() Looks at the object at the top of this stack without removing it from the stack.
Object	HashMap.get(Object key) Returns the value to which this map maps the specified key.
Object	HashMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	HashMap.remove(Object key) Removes the mapping for this key from this map if present.
Object	HashMap.clone() Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
Object[]	Set.toArray() Returns an array containing all of the elements in this set.
Object[]	Set.toArray(Object[] a) Returns an array containing all of the elements in this set whose runtime type is that of the specified array.
Object[]	List.toArray() Returns an array containing all of the elements in this list in proper sequence.
Object[]	List.toArray(Object[] a) Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array.
Object	List.get(int index) Returns the element at the specified position in this list.
Object	List.set(int index, Object element) Replaces the element at the specified position in this list with the specified element (optional operation).
Object	List.remove(int index) Removes the element at the specified position in this list (optional operation).
Object[]	Collection.toArray() Returns an array containing all of the elements in this collection.
Object[]	Collection.toArray(Object[] a) Returns an array containing all of the elements in this collection whose runtime type is that of the specified array.
Object[]	AbstractCollection.toArray() Returns an array containing all of the elements in this collection.
Object[]	AbstractCollection.toArray(Object[] a) Returns an array with a runtime type is that of the specified array and that contains all of the elements in this collection.
abstract Object	AbstractList.get(int index) Returns the element at the specified position in this list.
Object	AbstractList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element (optional operation).
Object	AbstractList.remove(int index) Removes the element at the specified position in this list (optional operation).
Object	Vector.elementAt(int index) Returns the component at the specified index.
Object	Vector.firstElement() Returns the first component (the item at index 0) of this vector.
Object	Vector.lastElement() Returns the last component of the vector.
Object	Vector.clone() Returns a clone of this vector.
Object[]	Vector.toArray() Returns an array containing all of the elements in this Vector in the correct order.
Object[]	Vector.toArray(Object[] a) Returns an array containing all of the elements in this Vector in the correct order.
Object	Vector.get(int index) Returns the element at the specified position in this Vector.
Object	Vector.set(int index, Object element) Replaces the element at the specified position in this Vector with the specified element.
Object	Vector.remove(int index) Removes the element at the specified position in this Vector.
Object	Map.get(Object key) Returns the value to which this map maps the specified key.
Object	Map.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	Map.remove(Object key) Removes the mapping for this key from this map if present (optional operation).
Object	Map.Entry.getKey() Returns the key corresponding to this entry.
Object	Map.Entry.getValue() Returns the value corresponding to this entry.
Object	Map.Entry.setValue(Object value) Replaces the value corresponding to this entry with the specified value (optional operation).
abstract Object	Dictionary.get(Object key) Returns the value to which the key is mapped in this dictionary.
abstract Object	Dictionary.put(Object key, Object value) Maps the specified key to the specified value in this dictionary.
abstract Object	Dictionary.remove(Object key) Removes the key (and its corresponding value) from this dictionary.
Object	Hashtable.get(Object key) Returns the value to which the specified key is mapped in this hashtable.
Object	Hashtable.put(Object key, Object value) Maps the specified key to the specified value in this hashtable.
Object	Hashtable.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
Object	Hashtable.clone() Creates a shallow copy of this hashtable.
Object	Locale.clone() Overrides Cloneable
Object	EventObject.getSource() The object on which the Event initially occurred.
Object	ListResourceBundle.handleGetObject(String key) Override of ResourceBundle, same semantics
protected abstract Object[][]	ListResourceBundle.getContents() See class description.
Object	TreeSet.first() Returns the first (lowest) element currently in this sorted set.
Object	TreeSet.last() Returns the last (highest) element currently in this sorted set.
Object	TreeSet.clone() Returns a shallow copy of this TreeSet instance.
Object	TreeMap.get(Object key) Returns the value to which this map maps the specified key.
Object	TreeMap.firstKey() Returns the first (lowest) key currently in this sorted map.
Object	TreeMap.lastKey() Returns the last (highest) key currently in this sorted map.
Object	TreeMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	TreeMap.remove(Object key) Removes the mapping for this key from this TreeMap if present.
Object	TreeMap.clone() Returns a shallow copy of this TreeMap instance.

Methods in java.util with parameters of type Object

boolean	WeakHashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
Object	WeakHashMap.get(Object key) Returns the value to which this map maps the specified key.
Object	WeakHashMap.put(Object key, Object value) Updates this map so that the given key maps to the given value.
Object	WeakHashMap.put(Object key, Object value) Updates this map so that the given key maps to the given value.
Object	WeakHashMap.remove(Object key) Removes the mapping for the given key from this map, if present.
boolean	PropertyPermission.equals(Object obj) Checks two PropertyPermission objects for equality.
void	LinkedList.addFirst(Object o) Inserts the given element at the beginning of this list.
void	LinkedList.addLast(Object o) Appends the given element to the end of this list.
boolean	LinkedList.contains(Object o) Returns true if this list contains the specified element.
boolean	LinkedList.add(Object o) Appends the specified element to the end of this list.
boolean	LinkedList.remove(Object o) Removes the first occurrence of the specified element in this list.
Object	LinkedList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
void	LinkedList.add(int index, Object element) Inserts the specified element at the specified position in this list.
int	LinkedList.indexOf(Object o) Returns the index in this list of the first occurrence of the specified element, or -1 if the List does not contain this element.
int	LinkedList.lastIndexOf(Object o) Returns the index in this list of the last occurrence of the specified element, or -1 if the list does not contain this element.
Object[]	LinkedList.toArray(Object[] a) Returns an array containing all of the elements in this list in the correct order.
SortedMap	SortedMap.subMap(Object fromKey, Object toKey) Returns a view of the portion of this sorted map whose keys range from fromKey, inclusive, to toKey, exclusive.
SortedMap	SortedMap.subMap(Object fromKey, Object toKey) Returns a view of the portion of this sorted map whose keys range from fromKey, inclusive, to toKey, exclusive.
SortedMap	SortedMap.headMap(Object toKey) Returns a view of the portion of this sorted map whose keys are strictly less than toKey.
SortedMap	SortedMap.tailMap(Object fromKey) Returns a view of the portion of this sorted map whose keys are greater than or equal to fromKey.
static int	Collections.binarySearch(List list, Object key) Searches the specified list for the specified object using the binary search algorithm.
static int	Collections.binarySearch(List list, Object key, Comparator c) Searches the specified list for the specified object using the binary search algorithm.
static void	Collections.fill(List list, Object o) Replaces all of the elements of the specified list with the specified element.
static Set	Collections.singleton(Object o) Returns an immutable set containing only the specified object.
static List	Collections.singletonList(Object o) Returns an immutable list containing only the specified object.
static Map	Collections.singletonMap(Object key, Object value) Returns an immutable map, mapping only the specified key to the specified value.
static Map	Collections.singletonMap(Object key, Object value) Returns an immutable map, mapping only the specified key to the specified value.
static List	Collections.nCopies(int n, Object o) Returns an immutable list consisting of n copies of the specified object.
SortedSet	SortedSet.subSet(Object fromElement, Object toElement) Returns a view of the portion of this sorted set whose elements range from fromElement, inclusive, to toElement, exclusive.
SortedSet	SortedSet.subSet(Object fromElement, Object toElement) Returns a view of the portion of this sorted set whose elements range from fromElement, inclusive, to toElement, exclusive.
SortedSet	SortedSet.headSet(Object toElement) Returns a view of the portion of this sorted set whose elements are strictly less than toElement.
SortedSet	SortedSet.tailSet(Object fromElement) Returns a view of the portion of this sorted set whose elements are greater than or equal to fromElement.
boolean	BitSet.equals(Object obj) Compares this object against the specified object.
static void	Arrays.sort(Object[] a) Sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
static void	Arrays.sort(Object[] a, int fromIndex, int toIndex) Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements.
static void	Arrays.sort(Object[] a, Comparator c) Sorts the specified array of objects according to the order induced by the specified comparator.
static void	Arrays.sort(Object[] a, int fromIndex, int toIndex, Comparator c) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
static int	Arrays.binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key, Comparator c) Searches the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key, Comparator c) Searches the specified array for the specified object using the binary search algorithm.
static boolean	Arrays.equals(Object[] a, Object[] a2) Returns true if the two specified arrays of Objects are equal to one another.
static boolean	Arrays.equals(Object[] a, Object[] a2) Returns true if the two specified arrays of Objects are equal to one another.
static void	Arrays.fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects.
static void	Arrays.fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects.
static void	Arrays.fill(Object[] a, int fromIndex, int toIndex, Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
static void	Arrays.fill(Object[] a, int fromIndex, int toIndex, Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
static List	Arrays.asList(Object[] a) Returns a fixed-size list backed by the specified array.
Object	AbstractSequentialList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
void	AbstractSequentialList.add(int index, Object element) Inserts the specified element at the specified position in this list.
boolean	GregorianCalendar.equals(Object obj) Compares this GregorianCalendar to an object reference.
boolean	SimpleTimeZone.equals(Object obj) Compares the equality of two SimpleTimeZone objects.
boolean	Date.equals(Object obj) Compares two dates for equality.
int	Date.compareTo(Object o) Compares this Date to another Object.
boolean	Calendar.equals(Object obj) Compares this calendar to the specified object.
boolean	Calendar.before(Object when) Compares the time field records.
boolean	Calendar.after(Object when) Compares the time field records.
boolean	AbstractSet.equals(Object o) Compares the specified object with this set for equality.
boolean	HashSet.contains(Object o) Returns true if this set contains the specified element.
boolean	HashSet.add(Object o) Adds the specified element to this set if it is not already present.
boolean	HashSet.remove(Object o) Removes the given element from this set if it is present.
boolean	ArrayList.contains(Object elem) Returns true if this list contains the specified element.
int	ArrayList.indexOf(Object elem) Searches for the first occurence of the given argument, testing for equality using the equals method.
int	ArrayList.lastIndexOf(Object elem) Returns the index of the last occurrence of the specified object in this list.
Object[]	ArrayList.toArray(Object[] a) Returns an array containing all of the elements in this list in the correct order.
Object	ArrayList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element.
boolean	ArrayList.add(Object o) Appends the specified element to the end of this list.
void	ArrayList.add(int index, Object element) Inserts the specified element at the specified position in this list.
void	ListIterator.set(Object o) Replaces the last element returned by next or previous with the specified element (optional operation).
void	ListIterator.add(Object o) Inserts the specified element into the list (optional operation).
boolean	AbstractMap.containsValue(Object value) Returns true if this map maps one or more keys to this value.
boolean	AbstractMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
Object	AbstractMap.get(Object key) Returns the value to which this map maps the specified key.
Object	AbstractMap.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	AbstractMap.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	AbstractMap.remove(Object key) Removes the mapping for this key from this map if present (optional operation).
boolean	AbstractMap.equals(Object o) Compares the specified object with this map for equality.
Object	Stack.push(Object item) Pushes an item onto the top of this stack.
int	Stack.search(Object o) Returns the 1-based position where an object is on this stack.
boolean	HashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	HashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
Object	HashMap.get(Object key) Returns the value to which this map maps the specified key.
Object	HashMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	HashMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	HashMap.remove(Object key) Removes the mapping for this key from this map if present.
boolean	Set.contains(Object o) Returns true if this set contains the specified element.
Object[]	Set.toArray(Object[] a) Returns an array containing all of the elements in this set whose runtime type is that of the specified array.
boolean	Set.add(Object o) Adds the specified element to this set if it is not already present (optional operation).
boolean	Set.remove(Object o) Removes the specified element from this set if it is present (optional operation).
boolean	Set.equals(Object o) Compares the specified object with this set for equality.
boolean	List.contains(Object o) Returns true if this list contains the specified element.
Object[]	List.toArray(Object[] a) Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array.
boolean	List.add(Object o) Appends the specified element to the end of this list (optional operation).
boolean	List.remove(Object o) Removes the first occurrence in this list of the specified element (optional operation).
boolean	List.equals(Object o) Compares the specified object with this list for equality.
Object	List.set(int index, Object element) Replaces the element at the specified position in this list with the specified element (optional operation).
void	List.add(int index, Object element) Inserts the specified element at the specified position in this list (optional operation).
int	List.indexOf(Object o) Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.
int	List.lastIndexOf(Object o) Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.
boolean	Collection.contains(Object o) Returns true if this collection contains the specified element.
Object[]	Collection.toArray(Object[] a) Returns an array containing all of the elements in this collection whose runtime type is that of the specified array.
boolean	Collection.add(Object o) Ensures that this collection contains the specified element (optional operation).
boolean	Collection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
boolean	Collection.equals(Object o) Compares the specified object with this collection for equality.
boolean	AbstractCollection.contains(Object o) Returns true if this collection contains the specified element.
Object[]	AbstractCollection.toArray(Object[] a) Returns an array with a runtime type is that of the specified array and that contains all of the elements in this collection.
boolean	AbstractCollection.add(Object o) Ensures that this collection contains the specified element (optional operation).
boolean	AbstractCollection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
boolean	AbstractList.add(Object o) Appends the specified element to the end of this List (optional operation).
Object	AbstractList.set(int index, Object element) Replaces the element at the specified position in this list with the specified element (optional operation).
void	AbstractList.add(int index, Object element) Inserts the specified element at the specified position in this list (optional operation).
int	AbstractList.indexOf(Object o) Returns the index in this list of the first occurence of the specified element, or -1 if the list does not contain this element.
int	AbstractList.lastIndexOf(Object o) Returns the index in this list of the last occurence of the specified element, or -1 if the list does not contain this element.
boolean	AbstractList.equals(Object o) Compares the specified object with this list for equality.
void	Vector.copyInto(Object[] anArray) Copies the components of this vector into the specified array.
boolean	Vector.contains(Object elem) Tests if the specified object is a component in this vector.
int	Vector.indexOf(Object elem) Searches for the first occurence of the given argument, testing for equality using the equals method.
int	Vector.indexOf(Object elem, int index) Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
int	Vector.lastIndexOf(Object elem) Returns the index of the last occurrence of the specified object in this vector.
int	Vector.lastIndexOf(Object elem, int index) Searches backwards for the specified object, starting from the specified index, and returns an index to it.
void	Vector.setElementAt(Object obj, int index) Sets the component at the specified index of this vector to be the specified object.
void	Vector.insertElementAt(Object obj, int index) Inserts the specified object as a component in this vector at the specified index.
void	Vector.addElement(Object obj) Adds the specified component to the end of this vector, increasing its size by one.
boolean	Vector.removeElement(Object obj) Removes the first (lowest-indexed) occurrence of the argument from this vector.
Object[]	Vector.toArray(Object[] a) Returns an array containing all of the elements in this Vector in the correct order.
Object	Vector.set(int index, Object element) Replaces the element at the specified position in this Vector with the specified element.
boolean	Vector.add(Object o) Appends the specified element to the end of this Vector.
boolean	Vector.remove(Object o) Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged.
void	Vector.add(int index, Object element) Inserts the specified element at the specified position in this Vector.
boolean	Vector.equals(Object o) Compares the specified Object with this Vector for equality.
boolean	Map.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	Map.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
Object	Map.get(Object key) Returns the value to which this map maps the specified key.
Object	Map.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	Map.put(Object key, Object value) Associates the specified value with the specified key in this map (optional operation).
Object	Map.remove(Object key) Removes the mapping for this key from this map if present (optional operation).
boolean	Map.equals(Object o) Compares the specified object with this map for equality.
Object	Map.Entry.setValue(Object value) Replaces the value corresponding to this entry with the specified value (optional operation).
boolean	Map.Entry.equals(Object o) Compares the specified object with this entry for equality.
abstract Object	Dictionary.get(Object key) Returns the value to which the key is mapped in this dictionary.
abstract Object	Dictionary.put(Object key, Object value) Maps the specified key to the specified value in this dictionary.
abstract Object	Dictionary.put(Object key, Object value) Maps the specified key to the specified value in this dictionary.
abstract Object	Dictionary.remove(Object key) Removes the key (and its corresponding value) from this dictionary.
boolean	Hashtable.contains(Object value) Tests if some key maps into the specified value in this hashtable.
boolean	Hashtable.containsValue(Object value) Returns true if this Hashtable maps one or more keys to this value.
boolean	Hashtable.containsKey(Object key) Tests if the specified object is a key in this hashtable.
Object	Hashtable.get(Object key) Returns the value to which the specified key is mapped in this hashtable.
Object	Hashtable.put(Object key, Object value) Maps the specified key to the specified value in this hashtable.
Object	Hashtable.put(Object key, Object value) Maps the specified key to the specified value in this hashtable.
Object	Hashtable.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	Hashtable.equals(Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
boolean	Locale.equals(Object obj) Returns true if this Locale is equal to another object.
int	Comparator.compare(Object o1, Object o2) Compares its two arguments for order.
int	Comparator.compare(Object o1, Object o2) Compares its two arguments for order.
boolean	Comparator.equals(Object obj) Indicates whether some other object is "equal to" this Comparator.
void	Observer.update(Observable o, Object arg) This method is called whenever the observed object is changed.
void	Observable.notifyObservers(Object arg) If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
boolean	TreeSet.contains(Object o) Returns true if this set contains the specified element.
boolean	TreeSet.add(Object o) Adds the specified element to this set if it is not already present.
boolean	TreeSet.remove(Object o) Removes the given element from this set if it is present.
SortedSet	TreeSet.subSet(Object fromElement, Object toElement) Returns a view of the portion of this set whose elements range from fromElement, inclusive, to toElement, exclusive.
SortedSet	TreeSet.subSet(Object fromElement, Object toElement) Returns a view of the portion of this set whose elements range from fromElement, inclusive, to toElement, exclusive.
SortedSet	TreeSet.headSet(Object toElement) Returns a view of the portion of this set whose elements are strictly less than toElement.
SortedSet	TreeSet.tailSet(Object fromElement) Returns a view of the portion of this set whose elements are greater than or equal to fromElement.
boolean	TreeMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	TreeMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
Object	TreeMap.get(Object key) Returns the value to which this map maps the specified key.
Object	TreeMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	TreeMap.put(Object key, Object value) Associates the specified value with the specified key in this map.
Object	TreeMap.remove(Object key) Removes the mapping for this key from this TreeMap if present.
SortedMap	TreeMap.subMap(Object fromKey, Object toKey) Returns a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive.
SortedMap	TreeMap.subMap(Object fromKey, Object toKey) Returns a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive.
SortedMap	TreeMap.headMap(Object toKey) Returns a view of the portion of this map whose keys are strictly less than toKey.
SortedMap	TreeMap.tailMap(Object fromKey) Returns a view of the portion of this map whose keys are greater than or equal to fromKey.

Constructors in java.util with parameters of type Object

EventObject(Object source)
Constructs a prototypical Event.

Uses of Object in java.util.jar

Subclasses of Object in java.util.jar

class	Attributes The Attributes class maps Manifest attribute names to associated string values.
static class	Attributes.Name The Attributes.Name class represents an attribute name stored in this Map.
class	JarEntry This class is used to represent a JAR file entry.
class	JarException Signals that an error of some sort has occurred while reading from or writing to a JAR file.
class	JarFile The JarFile class is used to read the contents of a JAR file from any file that can be opened with java.io.RandomAccessFile.
class	JarInputStream The JarInputStream class is used to read the contents of a JAR file from any input stream.
class	JarOutputStream The JarOutputStream class is used to write the contents of a JAR file to any output stream.
class	Manifest The Manifest class is used to maintain Manifest entry names and their associated Attributes.

Methods in java.util.jar that return Object

Object	Attributes.get(Object name) Returns the value of the specified attribute name, or null if the attribute name was not found.
Object	Attributes.put(Object name, Object value) Associates the specified value with the specified attribute name (key) in this Map.
Object	Attributes.remove(Object name) Removes the attribute with the specified name (key) from this Map.
Object	Attributes.clone() Returns a copy of the Attributes, implemented as follows:
Object	Manifest.clone() Returns a shallow copy of this Manifest, implemented as follows:

Methods in java.util.jar with parameters of type Object

Object	Attributes.get(Object name) Returns the value of the specified attribute name, or null if the attribute name was not found.
Object	Attributes.put(Object name, Object value) Associates the specified value with the specified attribute name (key) in this Map.
Object	Attributes.put(Object name, Object value) Associates the specified value with the specified attribute name (key) in this Map.
Object	Attributes.remove(Object name) Removes the attribute with the specified name (key) from this Map.
boolean	Attributes.containsValue(Object value) Returns true if this Map maps one or more attribute names (keys) to the specified value.
boolean	Attributes.containsKey(Object name) Returns true if this Map contains the specified attribute name (key).
boolean	Attributes.equals(Object o) Compares the specified Attributes object with this Map for equality.
boolean	Attributes.Name.equals(Object o) Compares this attribute name to another for equality.
boolean	Manifest.equals(Object o) Returns true if the specified Object is also a Manifest and has the same main Attributes and entries.

Uses of Object in java.util.zip

Subclasses of Object in java.util.zip

class	Adler32 A class that can be used to compute the Adler-32 checksum of a data stream.
class	CheckedInputStream An input stream that also maintains a checksum of the data being read.
class	CheckedOutputStream An output stream that also maintains a checksum of the data being written.
class	CRC32 A class that can be used to compute the CRC-32 of a data stream.
class	DataFormatException Signals that a data format error has occurred.
class	Deflater This class provides support for general purpose compression using the popular ZLIB compression library.
class	DeflaterOutputStream This class implements an output stream filter for compressing data in the "deflate" compression format.
class	GZIPInputStream This class implements a stream filter for reading compressed data in the GZIP format.
class	GZIPOutputStream This class implements a stream filter for writing compressed data in the GZIP file format.
class	Inflater This class provides support for general purpose decompression using popular ZLIB compression library.
class	InflaterInputStream This class implements a stream filter for uncompressing data in the "deflate" compression format.
class	ZipEntry This class is used to represent a ZIP file entry.
class	ZipException Signals that a Zip exception of some sort has occurred.
class	ZipFile This class is used to read entries from a zip file.
class	ZipInputStream This class implements an input stream filter for reading files in the ZIP file format.
class	ZipOutputStream This class implements an output stream filter for writing files in the ZIP file format.

Methods in java.util.zip that return Object

Object

ZipEntry.clone() Returns a copy of this entry.

Uses of Object in javax.microedition.io

Subclasses of Object in javax.microedition.io

class	ConnectionNotFoundException This class is used to signal that a connection target cannot be found
class	Connector This class is a placeholder for the static methods used to create all the connection objects.

Uses of Object in javax.microedition.xlet

Subclasses of Object in javax.microedition.xlet

class	UnavailableContainerException Signals that no Container can be provided for the Xlet to use at this time.
class	XletStateChangeException Signals that a requested Xlet state change failed.

Methods in javax.microedition.xlet that return Object

Object

XletContext.getXletProperty(String key) Provides an Xlet with a mechanism to retrieve named properties from the XletContext.

Uses of Object in javax.microedition.xlet.ixc

Subclasses of Object in javax.microedition.xlet.ixc

class	IxcRegistry IxcRegistry is the bootstrap mechanism for obtaining references to remote objects residing in other Xlets executing on the same machine, but in separate classloaders.
class	StubException StubException is thrown whenever stub class generation fails for inter-Xlet communication.