The System and Runtime Classes : System « Utility Classes « SCJP

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SCJP » Utility Classes » System 
8.29.1.The System and Runtime Classes
All methods and variables in the System class are static.

The System class automatically creates a standard input, standard output, and standard error output stream, 
named System.in, System.out, and System.err, respectively. 

The in stream gets data from the console. 

The out and err streams normally go to the Java console in a Web browser or a console window.
8.29.System
8.29.1.The System and Runtime Classes
8.29.2.A Timing Utility
8.29.3.The System class provides the exit method to stop the Java Virtual Machine (JVM).
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