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Uses of Package
java.lang

Packages that use java.lang
java.io Provides classes for input and output through data streams. 
java.lang Provides classes that are fundamental to the Java programming language. 
java.lang.ref Provides support for weak references. 
java.util Contains the collection classes, and the date and time facilities. 
 

Classes in java.lang used by java.io
Exception
          The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
Object
          Class Object is the root of the class hierarchy.
String
          The String class represents character strings.
Throwable
          The Throwable class is the superclass of all errors and exceptions in the Java language.
 

Classes in java.lang used by java.lang
Boolean
          The Boolean class wraps a value of the primitive type boolean in an object.
Class
          Instances of the class Class represent classes and interfaces in a running Java application.
ClassNotFoundException
          Thrown when an application tries to load in a class through its string name using the forName method in class Class but no definition for the class with the specified name could be found.
Double
          The Double class wraps a value of the primitive type double in an object.
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.
Float
          The Float class wraps a value of primitive type float in an object.
IllegalAccessException
          Thrown when an application tries to load in a class, but the currently executing method does not have access to the definition of the specified class, because the class is not public and in another package.
IllegalArgumentException
          Thrown to indicate that a method has been passed an illegal or inappropriate argument.
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 because it is an interface or is an abstract class.
Integer
          The Integer class wraps a value of the primitive type int in an object.
InterruptedException
          Thrown when a thread is waiting, sleeping, or otherwise paused for a long time and another thread interrupts it.
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.
Runnable
          The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.
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.
RuntimeException
          RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
String
          The String class represents character strings.
StringBuffer
          A string buffer implements a mutable sequence of characters.
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.
VirtualMachineError
          Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
 

Classes in java.lang used by java.lang.ref
Object
          Class Object is the root of the class hierarchy.
 

Classes in java.lang used by java.util
Exception
          The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
Object
          Class Object is the root of the class hierarchy.
Runnable
          The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.
RuntimeException
          RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
String
          The String class represents character strings.
Throwable
          The Throwable class is the superclass of all errors and exceptions in the Java language.
 


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