java.lang

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Java Source Code / Java Documentation » 6.0 JDK Core » lang » java.lang 
java.lang
Provides classes that are fundamental to the design of the Java programming language.
Java Source File NameTypeComment
AbstractMethodError.javaClass Thrown when an application tries to call an abstract method.
AbstractStringBuilder.javaClass A mutable sequence of characters.

Implements a modifiable string.

Appendable.javaInterface An object to which char sequences and values can be appended.
ApplicationShutdownHooks.javaClass
ArithmeticException.javaClass Thrown when an exceptional arithmetic condition has occurred.
ArrayIndexOutOfBoundsException.javaClass Thrown to indicate that an array has been accessed with an illegal index.
ArrayStoreException.javaClass Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
AssertionError.javaClass Thrown to indicate that an assertion has failed.
AssertionStatusDirectives.javaClass A collection of assertion status directives (such as "enable assertions in package p" or "disable assertions in class c").
Boolean.javaClass The Boolean class wraps a value of the primitive type boolean in an object.
Byte.javaClass The Byte class wraps a value of primitive type byte in an object.
Character.javaClass The Character class wraps a value of the primitive type char in an object.
CharacterData.javaClass
CharSequence.javaInterface A CharSequence is a readable sequence of char values.
Class.javaClass Instances of the class Class represent classes and interfaces in a running Java application.
ClassCastException.javaClass Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
ClassCircularityError.javaClass Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.
ClassFormatError.javaClass 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.javaClass A class loader is an object that is responsible for loading classes.
ClassNotFoundException.javaClass Thrown when an application tries to load in a class through its string name using:
  • The forName method in class Class.
  • The findSystemClass method in class ClassLoader .
  • The loadClass method in class ClassLoader.

but no definition for the class with the specified name could be found.

Cloneable.javaInterface A class implements the Cloneable interface to indicate to the java.lang.Object.clone method that it is legal for that method to make a field-for-field copy of instances of that class.
CloneNotSupportedException.javaClass 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.javaInterface This interface imposes a total ordering on the objects of each class that implements it.
Compiler.javaClass The Compiler class is provided to support Java-to-native-code compilers and related services.
ConditionalSpecialCasing.javaClass This is a utility class for String.toLowerCase() and String.toUpperCase(), that handles special casing with conditions.
Deprecated.javaAnnotation A program element annotated @Deprecated is one that programmers are discouraged from using, typically because it is dangerous, or because a better alternative exists.
Double.javaClass The Double class wraps a value of the primitive type double in an object.
Enum.javaClass This is the common base class of all Java language enumeration types.
EnumConstantNotPresentException.javaClass Thrown when an application tries to access an enum constant by name and the enum type contains no constant with the specified name.
Error.javaClass An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
Exception.javaClass The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
ExceptionInInitializerError.javaClass Signals that an unexpected exception has occurred in a static initializer.
Float.javaClass The Float class wraps a value of primitive type float in an object.
IllegalAccessError.javaClass Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
IllegalAccessException.javaClass 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.javaClass Thrown to indicate that a method has been passed an illegal or inappropriate argument.
IllegalMonitorStateException.javaClass 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.
IllegalStateException.javaClass Signals that a method has been invoked at an illegal or inappropriate time.
IllegalThreadStateException.javaClass Thrown to indicate that a thread is not in an appropriate state for the requested operation.
IncompatibleClassChangeError.javaClass Thrown when an incompatible class change has occurred to some class definition.
IndexOutOfBoundsException.javaClass 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.
InheritableThreadLocal.javaClass 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 inheritable thread-local variables for which the parent has values.
InstantiationError.javaClass Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.
InstantiationException.javaClass 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.
Integer.javaClass The Integer class wraps a value of the primitive type int in an object.
InternalError.javaClass Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
InterruptedException.javaClass Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity. Occasionally a method may wish to test whether the current thread has been interrupted, and if so, to immediately throw this exception.
Iterable.javaInterface Implementing this interface allows an object to be the target of the "foreach" statement.
LinkageError.javaClass 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.javaClass The Long class wraps a value of the primitive type long in an object.
Math.javaClass The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.

Unlike some of the numeric methods of class StrictMath , all implementations of the equivalent functions of class Math are not defined to return the bit-for-bit same results.

NegativeArraySizeException.javaClass Thrown if an application tries to create an array with negative size.
NoClassDefFoundError.javaClass Thrown if the Java Virtual Machine or a ClassLoader instance 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.
NoSuchFieldError.javaClass Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
NoSuchFieldException.javaClass Signals that the class doesn't have a field of a specified name.
NoSuchMethodError.javaClass 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.
NoSuchMethodException.javaClass Thrown when a particular method cannot be found.
NullPointerException.javaClass Thrown when an application attempts to use null in a case where an object is required.
Number.javaClass The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.
NumberFormatException.javaClass 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.javaClass Class Object is the root of the class hierarchy.
OutOfMemoryError.javaClass 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.
Override.javaAnnotation Indicates that a method declaration is intended to override a method declaration in a supertype.
package-info.java
Package.javaClass Package objects contain version information about the implementation and specification of a Java package. This versioning information is retrieved and made available by the ClassLoader instance that loaded the class(es).
Process.javaClass The ProcessBuilder.start and Runtime.exec(String[]String[]File) 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.
ProcessBuilder.javaClass This class is used to create operating system processes.

Each ProcessBuilder instance manages a collection of process attributes.

Readable.javaInterface A Readable is a source of characters.
Runnable.javaInterface The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.
Runtime.javaClass 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.javaClass RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
RuntimePermission.javaClass This class is for runtime permissions.
SecurityException.javaClass Thrown by the security manager to indicate a security violation.
SecurityManager.javaClass The security manager is a class that allows applications to implement a security policy.
Short.javaClass The Short class wraps a value of primitive type short in an object.
Shutdown.javaClass Package-private utility class containing data structures and logic governing the virtual-machine shutdown sequence.
StackOverflowError.javaClass Thrown when a stack overflow occurs because an application recurses too deeply.
StackTraceElement.javaClass An element in a stack trace, as returned by Throwable.getStackTrace .
StrictMath.javaClass The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
String.javaClass The String class represents character strings.
StringBuffer.javaClass A thread-safe, mutable sequence of characters.
StringBuilder.javaClass A mutable sequence of characters.
StringCoding.javaClass Utility class for string encoding and decoding.
StringIndexOutOfBoundsException.javaClass Thrown by String methods to indicate that an index is either negative or greater than the size of the string.
SuppressWarnings.javaAnnotation Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element).
System.javaClass The System class contains several useful class fields and methods.
Thread.javaClass A thread is a thread of execution in a program.
ThreadDeath.javaClass An instance of ThreadDeath is thrown in the victim thread when the (deprecated) Thread.stop method is invoked.

An application should catch instances of this class only if it must clean up after being terminated asynchronously.

ThreadGroup.javaClass A thread group represents a set of threads.
ThreadLocal.javaClass This class provides thread-local variables.
Throwable.javaClass The Throwable class is the superclass of all errors and exceptions in the Java language.
TypeNotPresentException.javaClass Thrown when an application tries to access a type using a string representing the type's name, but no definition for the type with the specified name can be found.
UnknownError.javaClass Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
UnsatisfiedLinkError.javaClass Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
UnsupportedClassVersionError.javaClass 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.
UnsupportedOperationException.javaClass Thrown to indicate that the requested operation is not supported.

This class is a member of the Java Collections Framework.

VerifyError.javaClass Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
VirtualMachineError.javaClass Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
Void.javaClass The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void.
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