Unexpectedly, when a friend gave this code and the test was run.

package VietSource.net.temp;

public class FunctionCallMain {
    private static int a = 0;
    public static void main(String[] args) {
        if (a == 2)
            System.exit(0);
        else ++a;
        System.out.println("This is main");
        callMain();
       
    }
   
    public static void callMain() {
        System.out.println("This is a function call main function");
        main(new String[]{"Quan"});
    }
}