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Uses of Class
java.lang.Object

Packages that use Object

java.io	Provides classes for input and output through data streams.
java.lang	Provides classes that are fundamental to the Java programming language.
java.util	Contains the collection classes, and the date and time facilities.
javax.microedition.io	Classes for the Generic Connection framework.
javax.microedition.lcdui	The UI API provides a set of features for implementation of user interfaces for MIDP applications.
javax.microedition.lcdui.game	The Game API package provides a series of classes that enable the development of rich gaming content for wireless devices.
javax.microedition.media	The MIDP 2.0 Media API is a directly compatible building block of the Mobile Media API (JSR-135) specification.
javax.microedition.midlet	The MIDlet package defines Mobile Information Device Profile applications and the interactions between the application and the environment in which the application runs.
javax.microedition.pki	Certificates are used to authenticate information for secure Connections.
javax.microedition.rms	The Mobile Information Device Profile provides a mechanism for MIDlets to persistently store data and later retrieve it.

Uses of Object in java.io

Subclasses of Object in java.io

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	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 output 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	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.
class	InterruptedIOException Signals that an I/O operation has been interrupted.
class	IOException Signals that an I/O exception of some sort has occurred.
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.
class	PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
class	Reader Abstract class for reading character streams.
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	Writer Abstract class for writing to character streams.

Fields in java.io declared as Object

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

Methods in java.io with parameters of type Object

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

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

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

Uses of Object in java.lang

Subclasses of Object in java.lang

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.
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	ClassNotFoundException Thrown when an application tries to load in a class through its string name using the forName method in class Class but no definition for the class with the specified name could be found.
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	Float The Float class wraps a value of primitive type float in an object.
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	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	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	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise paused for a long time and another thread interrupts it.
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.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoClassDefFoundError Thrown if the Java Virtual Machine 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	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
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	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	SecurityException Thrown by the system to indicate a security violation.
class	Short The Short class is the standard wrapper for short values.
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	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.

Methods in java.lang that return Object

Object

Class.newInstance() Creates a new instance of a class.

Methods in java.lang with parameters of type Object

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.
boolean	String.equals(Object anObject) Compares this string to the specified object.
static String	String.valueOf(Object obj) Returns the string representation of the Object argument.
boolean	Short.equals(Object obj) Compares this object to the specified object.
boolean	Object.equals(Object obj) Indicates whether some other object is "equal to" this one.
boolean	Long.equals(Object obj) Compares this object against the specified object.
boolean	Integer.equals(Object obj) Compares this object to the specified object.
boolean	Float.equals(Object obj) Compares this object against some other object.
boolean	Double.equals(Object obj) Compares this object against the specified object.
boolean	Character.equals(Object obj) Compares this object against the specified object.
boolean	Byte.equals(Object obj) Compares this object to the specified 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.
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	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.

Uses of Object in java.util

Subclasses of Object in java.util

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	Date The class Date represents a specific instant in time, with millisecond precision.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	Hashtable This class implements a hashtable, which maps keys to values.
class	NoSuchElementException Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers.
class	Stack The Stack class represents a last-in-first-out (LIFO) stack of objects.
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	Vector The Vector class implements a growable array of objects.

Fields in java.util declared as Object

protected Object[]

Vector.elementData The array buffer into which the components of the vector are stored.

Methods in java.util that return Object

Object	Vector.elementAt(int index) Returns the component at the specified index.
Object	Vector.firstElement() Returns the first component of this vector.
Object	Vector.lastElement() Returns the last component of the vector.
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	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	Enumeration.nextElement() Returns the next element of this enumeration if this enumeration object has at least one more element to provide.

Methods in java.util with parameters of type Object

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 occurrence of the argument from this vector.
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	Hashtable.contains(Object value) Tests if some key maps into the specified value in this hashtable.
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.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	Date.equals(Object obj) Compares two dates for equality.
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.

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, or the protocol type is not supported.
class	Connector This class is factory for creating new Connection objects.
class	PushRegistry The PushRegistry maintains a list of inbound connections.

Uses of Object in javax.microedition.lcdui

Subclasses of Object in javax.microedition.lcdui

class	Alert An alert is a screen that shows data to the user and waits for a certain period of time before proceeding to the next Displayable.
class	AlertType The AlertType provides an indication of the nature of alerts.
class	Canvas The Canvas class is a base class for writing applications that need to handle low-level events and to issue graphics calls for drawing to the display.
class	ChoiceGroup A ChoiceGroup is a group of selectable elements intended to be placed within a Form.
class	Command The Command class is a construct that encapsulates the semantic information of an action.
class	CustomItem A CustomItem is customizable by subclassing to introduce new visual and interactive elements into Forms.
class	DateField A DateField is an editable component for presenting date and time (calendar) information that may be placed into a Form.
class	Display Display represents the manager of the display and input devices of the system.
class	Displayable An object that has the capability of being placed on the display.
class	Font The Font class represents fonts and font metrics.
class	Form A Form is a Screen that contains an arbitrary mixture of items: images, read-only text fields, editable text fields, editable date fields, gauges, choice groups, and custom items.
class	Gauge Implements a graphical display, such as a bar graph, of an integer value.
class	Graphics Provides simple 2D geometric rendering capability.
class	Image The Image class is used to hold graphical image data.
class	ImageItem An item that can contain an image.
class	Item A superclass for components that can be added to a Form.
class	List A Screen containing list of choices.
class	Screen The common superclass of all high-level user interface classes.
class	Spacer A blank, non-interactive item that has a settable minimum size.
class	StringItem An item that can contain a string.
class	TextBox The TextBox class is a Screen that allows the user to enter and edit text.
class	TextField A TextField is an editable text component that may be placed into a Form.
class	Ticker Implements a "ticker-tape", a piece of text that runs continuously across the display.

Uses of Object in javax.microedition.lcdui.game

Subclasses of Object in javax.microedition.lcdui.game

class	GameCanvas The GameCanvas class provides the basis for a game user interface.
class	Layer A Layer is an abstract class representing a visual element of a game.
class	LayerManager The LayerManager manages a series of Layers.
class	Sprite A Sprite is a basic visual element that can be rendered with one of several frames stored in an Image; different frames can be shown to animate the Sprite.
class	TiledLayer A TiledLayer is a visual element composed of a grid of cells that can be filled with a set of tile images.

Uses of Object in javax.microedition.media

Subclasses of Object in javax.microedition.media

class	Manager Manager is the access point for obtaining system dependent resources such as Players for multimedia processing.
class	MediaException A MediaException indicates an unexpected error condition in a method.

Methods in javax.microedition.media with parameters of type Object

void	PlayerListener.playerUpdate(Player player, String event, Object eventData) This method is called to deliver an event to a registered listener when a Player event is observed.

Uses of Object in javax.microedition.midlet

Subclasses of Object in javax.microedition.midlet

class	MIDlet A MIDlet is a MID Profile application.
class	MIDletStateChangeException Signals that a requested MIDlet state change failed.

Uses of Object in javax.microedition.pki

Subclasses of Object in javax.microedition.pki

class

CertificateException The CertificateException encapsulates an error that occurred while a Certificate is being used.

Uses of Object in javax.microedition.rms

Subclasses of Object in javax.microedition.rms

class	InvalidRecordIDException Thrown to indicate an operation could not be completed because the record ID was invalid.
class	RecordStore A class representing a record store.
class	RecordStoreException Thrown to indicate a general exception occurred in a record store operation.
class	RecordStoreFullException Thrown to indicate an operation could not be completed because the record store system storage is full.
class	RecordStoreNotFoundException Thrown to indicate an operation could not be completed because the record store could not be found.
class	RecordStoreNotOpenException Thrown to indicate that an operation was attempted on a closed record store.