Provides classes that are fundamental to the design of the Java programming language. The most important classes are
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
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.
Math provides commonly used mathematical functions such as sine, cosine, and square root. The classes
StringBuilder similarly provide commonly used operations on character strings.
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.
Throwable encompasses objects that may be thrown by the
throw statement. Subclasses of
Throwable represent errors and exceptions.
Character EncodingsThe specification of the
java.nio.charset.Charsetclass describes the naming conventions for character encodings as well as the set of standard encodings that must be supported by every implementation of the Java platform.
An object to which
An object that may hold resources (such as file or socket handles) until it is closed.
A class implements the
This interface imposes a total ordering on the objects of each class that implements it.
Implementing this interface allows an object to be the target of the enhanced
ProcessHandle identifies and provides control of native processes.
Information snapshot about the process.
Interface for handlers invoked when a
The Boolean class wraps a value of the primitive type
Instances of this class represent particular subsets of the Unicode character set.
A family of character subsets representing the character blocks in the Unicode specification.
Instances of the class
A class loader is an object that is responsible for loading classes.
Lazily associate a computed value with (potentially) every type.
|Compiler||Deprecated, for removal: This API element is subject to removal in a future version. |
JIT compilers and their technologies vary too widely to be controlled effectively by a standardized interface.
|Enum<E extends Enum<E>>|| |
This is the common base class of all Java language enumeration types.
This class extends
Represents a run-time module, either
A layer of modules in the Java virtual machine.
Controls a module layer.
The abstract class
Represents metadata about a run-time package associated with a class loader.
This class is used to create operating system processes.
Represents a source of subprocess input or a destination of subprocess output.
Every Java application has a single instance of class
A representation of a version string for an implementation of the Java SE Platform.
This class is for runtime permissions.
The security manager is a class that allows applications to implement a security policy.
An element in a stack trace, as returned by
A stack walker.
A thread-safe, mutable sequence of characters.
A mutable sequence of characters.
A thread is a thread of execution in a program.
A thread group represents a set of threads.
This class provides thread-local variables.
A family of character subsets representing the character scripts defined in the Unicode Standard Annex #24: Script Names.
The type of a
Stack walker option to configure the stack frame information obtained by a
System loggers levels.
A thread state.
Thrown when an exceptional arithmetic condition has occurred.
Thrown to indicate that an array has been accessed with an illegal index.
Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
Thrown when an application tries to load in a class through its string name using: The
Thrown to indicate that the
Thrown when an application tries to access an enum constant by name and the enum type contains no constant with the specified name.
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.
Thrown to indicate that a method has been passed an illegal or inappropriate argument.
Thrown to indicate that a method has been called by an inappropriate caller.
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.
Signals that a method has been invoked at an illegal or inappropriate time.
Thrown to indicate that a thread is not in an appropriate state for the requested operation.
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.
Thrown when an application tries to create an instance of a class using the
Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.
Thrown when creating a module layer fails.
Thrown if an application tries to create an array with negative size.
Signals that the class doesn't have a field of a specified name.
Thrown when a particular method cannot be found.
Thrown when an application attempts to use
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.
Common superclass of exceptions thrown by reflective operations in core reflection.
Thrown by the security manager to indicate a security violation.
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.
Thrown to indicate that the requested operation is not supported.
Thrown when an application tries to call an abstract method.
Thrown to indicate that an assertion has failed.
Thrown to indicate that an
Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.
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.
Signals that an unexpected exception has occurred in a static initializer.
Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
Thrown when an incompatible class change has occurred to some class definition.
Thrown when an application tries to use the Java
Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
Thrown if the Java Virtual Machine or a
Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
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.
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.
Thrown when a stack overflow occurs because an application recurses too deeply.
An instance of
Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared
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.
Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
A program element annotated
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.
Indicates that a method declaration is intended to override a method declaration in a supertype.
A programmer assertion that the body of the annotated method or constructor does not perform potentially unsafe operations on its varargs parameter.
Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element).