>> I didn't realize i will be initiated as 0 if it is not be specified, so
you guys mean i=0 is system default? <<

Apparently so.  I wouldn't have believed it but it just worked, under JDK
1.3.1 on Windows 2000.  The following code outputs "0".

public class NotInit
{
        static int i;
        public static void main(String[] args)
        {
                System.out.println(i);
        }
}

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