Java.Lang Namespace

Classes

AbstractMethodError

Thrown when an application tries to call an abstract method.

AbstractStringBuilder

A mutable sequence of characters.

ArithmeticException

Thrown when an exceptional arithmetic condition has occurred.

ArrayIndexOutOfBoundsException

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

ArrayStoreException

Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.

AssertionError

Thrown to indicate that an assertion has failed.

Boolean

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

BootstrapMethodError

Thrown to indicate that an invokedynamic instruction has failed to find its bootstrap method, or the bootstrap method has failed to provide a java.

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
Character.UnicodeBlock

Represents a block of Unicode characters, as defined by the Unicode 4.0.1 specification.

Character.UnicodeScript
Class

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

ClassCastException

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.

ClassCircularityError

Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.

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: <ul> <li>The <code>forName</code> method in class <code>Class</code>.

CloneNotSupportedException

Thrown to indicate that the <code>clone</code> method in class <code>Object</code> has been called to clone an object, but that the object's class does not implement the <code>Cloneable</code> interface.

Compiler

Does nothing on Android.

Deprecated

Annotation type used to mark program elements that should no longer be used by programmers.

DeprecatedAttribute
Double

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

Enum

This is the common base class of all Java language enumeration types.

EnumConstantNotPresentException

Thrown when an application tries to access an enum constant by name and the enum type contains no constant with the specified name.

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.

ExceptionInInitializerError

Signals that an unexpected exception has occurred in a static initializer.

Float

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

FunctionalInterfaceAttribute
IAppendableExtensions
ICharSequenceExtensions
IllegalAccessError

Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.

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.

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.

IllegalStateException

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

IllegalThreadStateException

Thrown to indicate that a thread is not in an appropriate state for the requested operation.

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.

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 inheritable thread-local variables for which the parent has values.

InstantiationError

Thrown when an application tries to use the Java <code>new</code> construct to instantiate an abstract class or an interface.

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.

Integer

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

InternalError

Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.

InterruptedException

Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.

JavaSystem

The <code>System</code> class contains several useful class fields and methods.

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.

Math

The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.

NegativeArraySizeException

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

NoClassDefFoundError

Thrown if the Java Virtual Machine or a <code>ClassLoader</code> 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 <code>new</code> expression) and no definition of the class could be found.

NoSuchFieldError

Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.

NoSuchFieldException

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

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.

NoSuchMethodException

Thrown when a particular method cannot be found.

NullPointerException

Thrown when an application attempts to use null in a case where an object is required.

Number

The abstract class Number is the superclass of platform classes representing numeric values that are convertible to the primitive types byte, double, float, int, 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.

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.

Override

Annotation type used to mark methods that override a method declaration in a superclass.

OverrideAttribute
Package

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

Process

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

This class is used to create operating system processes.

ProcessBuilder.Redirect
ProcessBuilder.Redirect.Type
ReflectiveOperationException

Common superclass of exceptions thrown by reflective operations in core reflection.

Runnable
Runtime

Every Java application has a single instance of class <code>Runtime</code> 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.

RuntimePermission

Legacy security code; do not use.

SafeVarargsAttribute
SecurityException

Thrown by the security manager to indicate a security violation.

SecurityManager

Legacy security code; do not use.

Short

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

StackOverflowError

Thrown when a stack overflow occurs because an application recurses too deeply.

StackTraceElement

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

StrictMath

The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.

String

The String class represents character strings.

StringBuffer

A thread-safe, mutable sequence of characters.

StringBuilder

A mutable sequence of characters.

StringIndexOutOfBoundsException

Thrown by String methods to indicate that an index is either negative or greater than the size of the string.

SuppressWarnings

Annotation type used to indicate that the compiler should not issue the specified warnings for the marked program element.

SuppressWarningsAttribute
Thread

A thread is a thread of execution in a program.

Thread.State

A representation of a thread's state.

ThreadDeath

An instance of ThreadDeath is thrown in the victim thread when the (deprecated) Thread#stop() method is invoked.

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.

TypeNotPresentException

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

Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.

UnsatisfiedLinkError

Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared <code>native</code>.

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.

UnsupportedOperationException

Thrown to indicate that the requested operation is not supported.

VerifyError

Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.

VirtualMachineError

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

Void

The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void.

Interfaces

IAppendable

An object to which char sequences and values can be appended.

IAutoCloseable

An object that may hold resources (such as file or socket handles) until it is closed.

ICharSequence

A CharSequence is a readable sequence of <code>char</code> values.

ICloneable

A class implements the <code>Cloneable</code> 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.

IComparable

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

IDeprecated

Annotation type used to mark program elements that should no longer be used by programmers.

IFunctionalInterface

An informative annotation type used to indicate that an interface type declaration is intended to be a functional interface as defined by the Java Language Specification.

IIterable

Implementing this interface allows an object to be the target of the "for-each loop" statement.

IOverride

Annotation type used to mark methods that override a method declaration in a superclass.

IReadable

A Readable is a source of characters.

IRunnable

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

ISafeVarargs

Claims to the compiler that the annotation target does nothing potentially unsafe to its varargs argument.

ISuppressWarnings

Annotation type used to indicate that the compiler should not issue the specified warnings for the marked program element.

Thread.IUncaughtExceptionHandler

Implemented by objects that want to handle cases where a thread is being terminated by an uncaught exception.