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参考文章：
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问题
关于System.exit(status)这个方法，status数值不同的作用
exit
public static void exit(int status)
Terminates
the currently running Java Virtual Machine. The argument serves as a
status code; by convention, a nonzero status code indicates abnormal
termination.
This method calls theexitmethod in classRuntime. This method never returns normally.
The callSystem.exit(n)is effectively equivalent to the call:
Runtime.getRuntime().exit(n)
Parameters:
status- exit status.
Throws:
SecurityException- if a security manager exists and itscheckExitmethod doesn't allow exit with the specified status.
See Also:
