java.lang

Annotations

Deprecated	Annotation type used to mark program elements that should no longer be used by programmers.
Override	Annotation type used to mark methods that override a method declaration in a superclass.
SafeVarargs	Claims to the compiler that the annotation target does nothing potentially unsafe to its varargs argument.
SuppressWarnings	Annotation type used to indicate that the compiler should not issue the specified warnings for the marked program element.

Interfaces

Appendable	Declares methods to append characters or character sequences.
AutoCloseable	Defines an interface for classes that can (or need to) be closed once they are not used any longer.
CharSequence	This interface represents an ordered set of characters and defines the methods to probe them.
Cloneable	This (empty) interface must be implemented by all classes that wish to support cloning.
Comparable<T>	This interface should be implemented by all classes that wish to define a natural order of their instances.
Iterable<T>	Instances of classes that implement this interface can be used with the enhanced for loop.
Readable	Represents a sequence of characters that can be incrementally read (copied) into a `CharBuffer`.
Runnable	Represents a command that can be executed.
Thread.UncaughtExceptionHandler	Implemented by objects that want to handle cases where a thread is being terminated by an uncaught exception.

Classes

Boolean	The wrapper for the primitive type `boolean`.
Byte	The wrapper for the primitive type `byte`.
Character	The wrapper for the primitive type `char`.
Character.Subset
Character.UnicodeBlock	Represents a block of Unicode characters.
Class<T>	The in-memory representation of a Java class.
ClassLoader	Loads classes and resources from a repository.
Compiler	Does nothing on Android.
Double	The wrapper for the primitive type `double`.
Enum<E extends Enum<E>>	The superclass of all enumerated types.
Float	The wrapper for the primitive type `float`.
InheritableThreadLocal<T>	A thread-local variable whose value is passed from parent to child thread.
Integer	The wrapper for the primitive type `int`.
Long	The wrapper for the primitive type `long`.
Math	Class Math provides basic math constants and operations such as trigonometric functions, hyperbolic functions, exponential, logarithms, etc.
Number	The abstract superclass of the classes which represent numeric base types (that is `Byte`, `Short`, `Integer`, `Long`, `Float`, and `Double`.
Object	The root class of the Java class hierarchy.
Package	Contains information about a Java package.
Process	Represents an external process.
ProcessBuilder	Creates operating system processes.
Runtime	Allows Java applications to interface with the environment in which they are running.
RuntimePermission	Legacy security code; do not use.
SecurityManager	Legacy security code; do not use.
Short	The wrapper for the primitive type `short`.
StackTraceElement	A representation of a single stack frame.
StrictMath	Class StrictMath provides basic math constants and operations such as trigonometric functions, hyperbolic functions, exponential, logarithms, etc.
String	An immutable sequence of UTF-16 `char`s.
StringBuffer	A modifiable `sequence of characters` for use in creating strings, where all accesses are synchronized.
StringBuilder	A modifiable `sequence of characters` for use in creating strings.
System	Provides access to system-related information and resources including standard input and output.
Thread	A `Thread` is a concurrent unit of execution.
ThreadGroup	`ThreadGroup` is a means of organizing threads into a hierarchical structure.
ThreadLocal<T>	Implements a thread-local storage, that is, a variable for which each thread has its own value.
Throwable	The superclass of all classes which can be thrown by the VM.
Void	Placeholder class for the Java keyword `void`.

Enums

Thread.State A representation of a thread's state.

Exceptions

ArithmeticException	Thrown when the an invalid arithmetic operation is attempted.
ArrayIndexOutOfBoundsException	Thrown when the an array is indexed with a value less than zero, or greater than or equal to the size of the array.
ArrayStoreException	Thrown when a program attempts to store an element of an incompatible type in an array.
ClassCastException	Thrown when a program attempts to cast a an object to a type with which it is not compatible.
ClassNotFoundException	Thrown when a class loader is unable to find a class.
CloneNotSupportedException	Thrown when a program attempts to clone an object which does not support the `Cloneable` interface.
EnumConstantNotPresentException	Thrown if an `enum` constant does not exist for a particular name.
Exception	`Exception` is the superclass of all classes that represent recoverable exceptions.
IllegalAccessException	Thrown when a program attempts to access a field or method which is not accessible from the location where the reference is made.
IllegalArgumentException	Thrown when a method is invoked with an argument which it can not reasonably deal with.
IllegalMonitorStateException	Thrown when a monitor operation is attempted when the monitor is not in the correct state, for example when a thread attempts to exit a monitor which it does not own.
IllegalStateException	Thrown when an action is attempted at a time when the VM is not in the correct state.
IllegalThreadStateException	Thrown when an operation is attempted which is not possible given the state that the executing thread is in.
IndexOutOfBoundsException	Thrown when a program attempts to access a value in an indexable collection using a value which is outside of the range of valid indices.
InstantiationException	Thrown when a program attempts to access a constructor which is not accessible from the location where the reference is made.
InterruptedException	Thrown when a waiting thread is activated before the condition it was waiting for has been satisfied.
NegativeArraySizeException	Thrown when an attempt is made to create an array with a size of less than zero.
NoSuchFieldException	Thrown when the VM notices that a program tries to reference, on a class or object, a field that does not exist.
NoSuchMethodException	Thrown when the VM notices that a program tries to reference, on a class or object, a method that does not exist.
NullPointerException	Thrown when a program tries to access a field or method of an object or an element of an array when there is no instance or array to use, that is if the object or array points to `null`.
NumberFormatException	Thrown when an invalid value is passed to a string-to-number conversion method.
ReflectiveOperationException	Superclass of exceptions related to reflection.
RuntimeException	`RuntimeException` is the superclass of all classes that represent exceptional conditions which occur as a result of executing an application in the VM.
SecurityException	Thrown when a security manager check fails.
StringIndexOutOfBoundsException	Thrown when the a string is indexed with a value less than zero, or greater than or equal to the size of the array.
TypeNotPresentException	Thrown when a program tries to access a class, interface, enum or annotation type through a string that contains the type's name and the type cannot be found.
UnsupportedOperationException	Thrown when an unsupported operation is attempted.

Errors

AbstractMethodError	Thrown by the VM when an abstract method is called.
AssertionError	Thrown when an assertion has failed.
ClassCircularityError	Thrown when the VM notices that an attempt is made to load a class which would directly or indirectly inherit from one of its subclasses.
ClassFormatError	Thrown by a class loader when a class file has an illegal format or if the data that it contains can not be interpreted as a class.
Error	`Error` is the superclass of all classes that represent unrecoverable errors.
ExceptionInInitializerError	Thrown when an exception occurs during class initialization.
IllegalAccessError	Thrown when the runtime notices that a program tries to access a class or member which is not accessible from where it is referenced.
IncompatibleClassChangeError	`IncompatibleClassChangeError` is the superclass of all classes which represent errors that occur when inconsistent class files are loaded into the same running image.
InstantiationError	Thrown when the VM notices that a program tries to create a new instance of a class which has no visible constructors from the location where `new` is invoked.
InternalError	Thrown when the VM notices that it has gotten into an undefined state.
LinkageError	`LinkageError` is the superclass of all error classes that occur when loading and linking class files.
NoClassDefFoundError	Thrown when the VM is unable to locate a class which it has been asked to load.
NoSuchFieldError	Thrown when the VM notices that a program tries to reference, on a class or object, a field that does not exist.
NoSuchMethodError	Thrown when the VM notices that a program tries to reference, on a class or object, a method that does not exist.
OutOfMemoryError	Thrown when a request for memory is made that can not be satisfied using the available platform resources.
StackOverflowError	Thrown when the depth of the stack of the running program exceeds some platform or VM specific limit.
ThreadDeath	ThreadDeath is thrown when a thread stops executing.
UnknownError	Thrown when the VM must throw an error which does not match any known exceptional condition.
UnsatisfiedLinkError	Thrown when an attempt is made to invoke a native for which an implementation could not be found.
UnsupportedClassVersionError	Thrown when an attempt is made to load a class with a format version that is not supported by the VM.
VerifyError	Thrown when the VM notices that an attempt is made to load a class which does not pass the class verification phase.
VirtualMachineError	`VirtualMachineError` is the superclass of all error classes that occur during the operation of the VM.

Results

Annotations

Interfaces

Classes

Enums

Exceptions

Errors

java.lang

Annotations

Interfaces

Classes

Enums

Exceptions

Errors