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Uses of Package
java.lang

Packages that use java.lang

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.font	Provides classes and interface relating to fonts.
java.awt.im	Provides classes and interfaces for the input method framework.
java.awt.image	Provides classes for creating and modifying images.
java.beans	Contains classes for run-time Java Beans support.
java.io	Provides for system input and output through data streams, serialization and the file system.
java.lang	Provides classes that are fundamental to the design of the Java programming language.
java.lang.ref	Provides reference-object classes, which support a limited degree of interaction with the garbage collector.
java.lang.reflect	Provides classes and interfaces for obtaining reflective information about classes and objects.
java.math	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net	Provides the classes for implementing networking applications.
java.rmi	Provides the RMI package.
java.rmi.registry	Provides APIs related to the RMI registry.
java.security	Provides the classes and interfaces for the security framework.
java.security.acl	The classes and interfaces in this package have been superseded by classes in the java.security package.
java.security.cert	Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
java.security.spec	Provides classes and interfaces for key specifications and algorithm parameter specifications.
java.text	Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
java.util	Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).
java.util.jar	Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.
java.util.zip	Provides classes for reading and writing the standard ZIP and GZIP file formats.
javax.microedition.io	Provides a simplified mechanism for applications to use various types of I/O protocols in resource-constrained environments.
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).
javax.security.auth.x500	This package contains the classes that should be used to store X500 Principal and X500 Private Crendentials in a Subject.

Classes in java.lang used by java.applet

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Classes in java.lang used by java.awt

Character
The Character class wraps a value of the primitive type char in an object.

Class
Instances of the class Class represent classes and interfaces in a running Java application.

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Error
An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalStateException
Signals that a method has been invoked at an illegal or inappropriate time.

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.

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.

Object
Class Object is the root of the class hierarchy.

Runnable
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

UnsupportedOperationException
Thrown to indicate that the requested operation is not supported.

Classes in java.lang used by java.awt.color

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Classes in java.lang used by java.awt.datatransfer

Class
Instances of the class Class represent classes and interfaces in a running Java application.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in class Class.

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that 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.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.awt.event

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

Runnable
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.

String
The String class represents character strings.

Classes in java.lang used by java.awt.font

Boolean
The Boolean class wraps a value of the primitive type boolean in an object.

Float
The Float class wraps a value of primitive type float in an object.

Integer
The Integer class wraps a value of the primitive type int in an object.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Classes in java.lang used by java.awt.im

Character.Subset
Instances of this class represent particular subsets of the Unicode character set.

Object
Class Object is the root of the class hierarchy.

Classes in java.lang used by java.awt.image

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

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.

Object
Class Object is the root of the class hierarchy.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.beans

ClassLoader
A class loader is an object that is responsible for loading classes.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in class Class.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.io

Class
Instances of the class Class represent classes and interfaces in a running Java application.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in class Class.

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

Object
Class Object is the root of the class hierarchy.

SecurityException
Thrown by the security manager to indicate a security violation.

String
The String class represents character strings.

StringBuffer
A string buffer implements a mutable sequence of characters.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.lang

Boolean
The Boolean class wraps a value of the primitive type boolean in an object.

Byte
The Byte class wraps a value of primitive type byte in an object.

Character
The Character class wraps a value of the primitive type char in an object.

Character.Subset
Instances of this class represent particular subsets of the Unicode character set.

Character.UnicodeBlock
A family of character subsets representing the character blocks in the Unicode specification.

CharSequence
A CharSequence is a readable sequence of characters.

Class
Instances of the class Class represent classes and interfaces in a running Java application.

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.

ClassLoader
A class loader is an object that is responsible for loading classes.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in 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.

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Double
The Double class wraps a value of the primitive type double in an object.

Error
An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Float
The Float class wraps a value of primitive type float in an object.

IllegalAccessException
An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

IncompatibleClassChangeError
Thrown when an incompatible class change has occurred to some class definition.

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.

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.

Integer
The Integer class wraps a value of the primitive type int in an object.

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.

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.

Long
The Long class wraps a value of the primitive type long in an object.

NoSuchFieldException
Signals that the class doesn't have a field of a specified name.

NoSuchMethodException
Thrown when a particular method cannot be found.

Number
The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.

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.

Object
Class Object is the root of the class hierarchy.

Package
Package objects contain version information about the implementation and specification of a Java package.

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.

Runnable
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.

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.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

SecurityException
Thrown by the security manager to indicate a security violation.

SecurityManager
The security manager is a class that allows applications to implement a security policy.

Short
The Short class wraps a value of primitive type short in an object.

StackTraceElement
An element in a stack trace, as returned by Throwable.getStackTrace().

String
The String class represents character strings.

StringBuffer
A string buffer implements a mutable sequence of characters.

Thread
A thread is a thread of execution in a program.

ThreadGroup
A thread group represents a set of threads.

ThreadLocal
This class provides thread-local variables.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

VirtualMachineError
Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.

Classes in java.lang used by java.lang.ref

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

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.

Object
Class Object is the root of the class hierarchy.

Classes in java.lang used by java.lang.reflect

ArrayIndexOutOfBoundsException
Thrown to indicate that an array has been accessed with an illegal index.

Class
Instances of the class Class represent classes and interfaces in a running Java application.

ClassLoader
A class loader is an object that is responsible for loading classes.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalAccessException
An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

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.

NegativeArraySizeException
Thrown if an application tries to create an array with negative size.

Object
Class Object is the root of the class hierarchy.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

SecurityException
Thrown by the security manager to indicate a security violation.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.math

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Number
The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Classes in java.lang used by java.net

Class
Instances of the class Class represent classes and interfaces in a running Java application.

ClassLoader
A class loader is an object that is responsible for loading classes.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in class Class.

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

Object
Class Object is the root of the class hierarchy.

Package
Package objects contain version information about the implementation and specification of a Java package.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.rmi

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.rmi.registry

String
The String class represents character strings.

Classes in java.lang used by java.security

Class
Instances of the class Class represent classes and interfaces in a running Java application.

ClassLoader
A class loader is an object that is responsible for loading classes.

ClassNotFoundException
Thrown when an application tries to load in a class through its string name using: The forName method in class Class.

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that 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.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

Object
Class Object is the root of the class hierarchy.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

SecurityException
Thrown by the security manager to indicate a security violation.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.security.acl

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.security.cert

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.security.spec

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.text

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Number
The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

StringBuffer
A string buffer implements a mutable sequence of characters.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.util

ClassLoader
A class loader is an object that is responsible for loading classes.

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that 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.

Comparable
This interface imposes a total ordering on the objects of each class that implements it.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

Runnable
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.

RuntimeException
RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.util.jar

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by java.util.zip

Cloneable
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by javax.microedition.io

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

IllegalArgumentException
Thrown to indicate that a method has been passed an illegal or inappropriate argument.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by javax.microedition.xlet

ClassLoader
A class loader is an object that is responsible for loading classes.

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by javax.microedition.xlet.ixc

Exception
The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.

Throwable
The Throwable class is the superclass of all errors and exceptions in the Java language.

Classes in java.lang used by javax.security.auth.x500

Object
Class Object is the root of the class hierarchy.

String
The String class represents character strings.