java-basics: What is System.exit in Java?

The java.lang.System.exit() method terminates the currently running Java Virtual Machine.
The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.

Following is the declaration for java.lang.System.exit() method :
public static void exit(int status)

***************************** Example of System.exit() method *****************************

package in.anyforum;

import java.lang.*;

public class SystemDemo {

public static void main(String[] args) {

int arr1[] = { 0, 1, 2, 3, 4, 5 };
int arr2[] = { 0, 10, 20, 30, 40, 50 };
int i;

// copies an array from the specified source array
System.arraycopy(arr1, 0, arr2, 0, 1);
System.out.print("array2 = ");
System.out.print(arr2[0] + " ");
System.out.print(arr2[1] + " ");
System.out.println(arr2[2] + " ");

for(i = 0;i < 3;i++) {
if(arr2[i] > = 20) {
System.out.println("exit...");
System.exit(0);
}
else {
System.out.println("arr2["+i+"] = " + arr2[i]);
}
}
}
}

================================ Output ================================

array2 = 0 10 20
arr2[0] = 0
arr2[1] = 10
exit...