what is the difference between System.exit() and System.exit(1)?

what is the difference between System.exit() and
System.exit(1)?

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what is the difference between System.exit() and System.exit(1)?..

A non-zero exit status code, usually indicates abnormal termination. if n != 0, its up to the programmer to apply a meaning to the various n's.

From http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System.html

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