The Boolean class wraps a value of the primitive type boolean in an object.
The Byte class wraps a value of primitive type byte in an object.
The Character class wraps a value of the primitive type char in an object.
Instances of this class represent particular subsets of the Unicode character set.
Character.UnicodeBlockA family of character subsets representing the character blocks in the Unicode specification.
Class<T>Instances of the class Class represent classes and interfaces in a running Java application.
A class loader is an object that is responsible for loading classes.
ClassValue<T>Lazily associate a computed value with (potentially) every type.
CompilerThe Compiler class is provided to support Java-to-native-code compilers and related services.
The Double class wraps a value of the primitive type double in an object.
This is the common base class of all Java language enumeration types.
FloatThe Float class wraps a value of primitive type float in an object.
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.
IntegerThe Integer class wraps a value of the primitive type int in an object.
The Long class wraps a value of the primitive type long in an object.
The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.
Class Object is the root of the class hierarchy.
Package objects contain version information about the implementation and specification of a Java package.
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.
ProcessBuilderThis class is used to create operating system processes.
ProcessBuilder.RedirectRepresents a source of subprocess input or a destination of subprocess output.
RuntimeEvery Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running.
This class is for runtime permissions.
SecurityManagerThe security manager is a class that allows applications to implement a security policy.
ShortThe Short class wraps a value of primitive type short in an object.
The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
The String class represents character strings.
A thread-safe, mutable sequence of characters.
StringBuilderA mutable sequence of characters.
SystemThe System class contains several useful class fields and methods.
A thread is a thread of execution in a program.
ThreadGroupA thread group represents a set of threads.
ThreadLocal<T>This class provides thread-local variables.
ThrowableThe Throwable class is the superclass of all errors and exceptions in the Java language.
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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