Use of System.exit(0) [duplicate]

Question

public class WrapperTest {
    static {
        print(10);
    }

    static void print(int x) {
        System.out.println(x);
        System.exit(0);
    }
}

In the above code System.exit(0) is used to stop the program. What argument does that method take? Why do we gave it as 0. Can anyone explain the concept?

Answer 1

From the JAVA Documentation:

The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.

And Wikipedia adds additional information.

Answer 2

It's the return value that the Java process will report to the calling process.

It hasn't really got a precise definition, but the usual convention is that 0 means success and any non-zero value represents a failure.