See: Description
Interface | Description |
---|---|
Appendable |
An object to which char sequences and values can be appended.
|
AutoCloseable |
An object that may hold resources (such as file or socket handles)
until it is closed.
|
CharSequence |
A CharSequence is a readable sequence of
char values. |
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<T> |
This interface imposes a total ordering on the objects of each class that
implements it.
|
Iterable<T> |
Implementing this interface allows an object to be the target of
the "for-each loop" statement.
|
Runnable |
The
Runnable interface should be implemented by any
class whose instances are intended to be executed by a thread. |
Class | Description |
---|---|
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. |
Class<T> |
Instances of the class
Class represent classes and
interfaces in a running Java application. |
Double |
The
Double class wraps a value of the primitive type
double in an object. |
Enum<E extends Enum<E>> |
This is the common base class of all Java language enumeration types.
|
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. |
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. |
Number |
The abstract class
Number is the superclass of
Byte , Double , Float ,
Integer , Long , and Short . |
Object |
Class
Object is the root of the class hierarchy. |
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. |
RuntimePermission |
This class is for runtime permissions.
|
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. |
String |
The
String class represents character strings. |
StringBuffer |
A thread-safe, mutable sequence of characters.
|
StringBuilder |
A mutable sequence of characters.
|
System |
The
System class contains several useful class fields
and methods. |
Thread |
A thread is a thread of execution in a program.
|
Throwable |
The
Throwable class is the superclass of all errors and
exceptions in the Java language. |
Exception | Description |
---|---|
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.
|
ClassCastException |
Thrown to indicate that the code has attempted to cast an object
to a subclass of which it is not an instance.
|
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. |
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 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.
|
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. |
InterruptedException |
Thrown when a thread is waiting, sleeping, or otherwise occupied,
and the thread is interrupted, either before or during the activity.
|
NegativeArraySizeException |
Thrown if an application tries to create an array with negative size.
|
NullPointerException |
Thrown when an application attempts to use
null in a
case where an object is required. |
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.
|
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.
|
StringIndexOutOfBoundsException |
Thrown by
String methods to indicate that an index
is either negative or greater than the size of the string. |
UnsupportedOperationException |
Thrown to indicate that the requested operation is not supported.
|
Error | Description |
---|---|
AssertionError |
Thrown to indicate that an assertion has failed.
|
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.
|
Error |
An
Error is a subclass of Throwable
that indicates serious problems that a reasonable application
should not try to catch. |
IncompatibleClassChangeError |
Thrown when an incompatible class change has occurred to some class
definition.
|
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. |
NoClassDefFoundError |
Thrown if the Java Virtual Machine
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 |
Thrown if an application tries to access or modify a specified
field of an object, and that object no longer has that field.
|
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.
|
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.
|
VirtualMachineError |
Thrown to indicate that the Java Virtual Machine is broken or has
run out of resources necessary for it to continue operating.
|
Annotation Type | Description |
---|---|
Deprecated |
A program element annotated @Deprecated is one that programmers
are discouraged from using, typically because it is dangerous,
or because a better alternative exists.
|
Override |
Indicates that a method declaration is intended to override a
method declaration in a supertype.
|
SuppressWarnings |
Indicates that the named compiler warnings should be suppressed in the
annotated element (and in all program elements contained in the annotated
element).
|
Object
, which is the root of the class hierarchy, and Class
, instances of which represent classes at run time.
Frequently it is necessary to represent a value of primitive
type as if it were an object. The wrapper classes Boolean
,
Character
, Integer
, Long
, Float
,
and Double
serve this purpose. An object of type Double
, for example, contains a field whose type is double,
representing that value in such a way that a reference to it can be
stored in a variable of reference type. These classes also provide
a number of methods for converting among primitive values, as well
as supporting such standard methods as equals and hashCode. The
Void
class is a non-instantiable class that holds a
reference to a Class
object representing the type void.
The class Math
provides commonly used mathematical
functions such as sine, cosine, and square root. The classes String
, StringBuffer
, and StringBuilder
similarly
provide commonly used operations on character strings.
Classes Runtime
, SecurityManager
, and
System
provide "system operations" that manage the dynamic
loading of classes, creation of external processes, host
environment inquiries such as the time of day, and enforcement of
security policies.
Class Throwable
encompasses objects that may be thrown
by the throw
statement. Subclasses of Throwable
represent errors and exceptions.
Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. Use of this specification is subject to license terms.