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JDK 1.6
  Package: java.lang
Author(s)
Since
JDK1.0
Version
Serial
Description
  Provides classes that are fundamental to the design of the Java programming language.
See also:   
AbstractMethodError View Source Thrown when an application tries to call an abstract method.
Appendable View Source An object to which char sequences and values can be appended.
ArithmeticException View Source Thrown when an exceptional arithmetic condition has occurred.
ArrayIndexOutOfBoundsException View Source Thrown to indicate that an array has been accessed with an illegal index.
ArrayStoreException View Source Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
AssertionError View Source Thrown to indicate that an assertion has failed.
Boolean View Source The Boolean class wraps a value of the primitive type boolean in an object.
Byte View Source The Byte class wraps a value of primitive type byte in an object.
Character View Source The Character class wraps a value of the primitive type char in an object.
Character.Subset View Source Instances of this class represent particular subsets of the Unicode character set.
Character.UnicodeBlock View Source A family of character subsets representing the character blocks in the Unicode specification.
CharSequence View Source A CharSequence is a readable sequence of char values.
Class View Source Instances of the class Class represent classes and interfaces in a running Java application.
ClassCastException View Source Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
ClassCircularityError View Source Thrown when a circularity has been detected while initializing a class.
ClassFormatError View Source 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 View Source A class loader is an object that is responsible for loading classes.
ClassNotFoundException View Source Thrown when an application tries to load in a class through its string name using: The forName method in class Class.
Cloneable View Source 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 View Source 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 View Source This interface imposes a total ordering on the objects of each class that implements it.
Compiler View Source The Compiler class is provided to support Java-to-native-code compilers and related services.
Deprecated View Source 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 View Source The Double class wraps a value of the primitive type double in an object.
Enum View Source This is the common base class of all Java language enumeration types.
EnumConstantNotPresentException View Source Thrown when an application tries to access an enum constant by name and the enum type contains no constant with the specified name.
Error View Source An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
Exception View Source The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
ExceptionInInitializerError View Source Signals that an unexpected exception has occurred in a static initializer.
Float View Source The Float class wraps a value of primitive type float in an object.
IllegalAccessError View Source Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
IllegalAccessException View Source 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 View Source Thrown to indicate that a method has been passed an illegal or inappropriate argument.
IllegalMonitorStateException View Source 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 View Source Signals that a method has been invoked at an illegal or inappropriate time.
IllegalThreadStateException View Source Thrown to indicate that a thread is not in an appropriate state for the requested operation.
IncompatibleClassChangeError View Source Thrown when an incompatible class change has occurred to some class definition.
IndexOutOfBoundsException View Source 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 View Source 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 View Source Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.
InstantiationException View Source 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 View Source The Integer class wraps a value of the primitive type int in an object.
InternalError View Source Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
InterruptedException View Source Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.
Iterable View Source Implementing this interface allows an object to be the target of the "foreach" statement.
LinkageError View Source 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 View Source The Long class wraps a value of the primitive type long in an object.
Math View Source The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
NegativeArraySizeException View Source Thrown if an application tries to create an array with negative size.
NoClassDefFoundError View Source 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 View Source Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
NoSuchFieldException View Source Signals that the class doesn't have a field of a specified name.
NoSuchMethodError View Source 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 View Source Thrown when a particular method cannot be found.
NullPointerException View Source Thrown when an application attempts to use null in a case where an object is required.
Number View Source The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.
NumberFormatException View Source 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 View Source Class Object is the root of the class hierarchy.
OutOfMemoryError View Source 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 View Source Indicates that a method declaration is intended to override a method declaration in a superclass.
Package View Source Package objects contain version information about the implementation and specification of a Java package.
Process View Source The ProcessBuilder.start() and 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 View Source This class is used to create operating system processes.
Readable View Source A Readable is a source of characters.
Runnable View Source The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.
Runtime View Source 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 View Source RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
RuntimePermission View Source This class is for runtime permissions.
SecurityException View Source Thrown by the security manager to indicate a security violation.
SecurityManager View Source The security manager is a class that allows applications to implement a security policy.
Short View Source The Short class wraps a value of primitive type short in an object.
StackOverflowError View Source Thrown when a stack overflow occurs because an application recurses too deeply.
StackTraceElement View Source An element in a stack trace, as returned by Throwable.getStackTrace().
StrictMath View Source The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
String View Source The String class represents character strings.
StringBuffer View Source A thread-safe, mutable sequence of characters.
StringBuilder View Source A mutable sequence of characters.
StringIndexOutOfBoundsException View Source Thrown by String methods to indicate that an index is either negative or greater than the size of the string.
SuppressWarnings View Source Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element).
System View Source The System class contains several useful class fields and methods.
Thread View Source A thread is a thread of execution in a program.
Thread.State View Source A thread state.
Thread.UncaughtExceptionHandler View Source Interface for handlers invoked when a Thread abruptly terminates due to an uncaught exception.
ThreadDeath View Source An instance of ThreadDeath is thrown in the victim thread when the stop method with zero arguments in class Thread is called.
ThreadGroup View Source A thread group represents a set of threads.
ThreadLocal View Source This class provides thread-local variables.
Throwable View Source The Throwable class is the superclass of all errors and exceptions in the Java language.
TypeNotPresentException View Source 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 View Source Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
UnsatisfiedLinkError View Source Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
UnsupportedClassVersionError View Source 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 View Source Thrown to indicate that the requested operation is not supported.
VerifyError View Source Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
VirtualMachineError View Source Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
Void View Source 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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