call

import java.util.Scanner;
public class call {

    static void call_by_value(int a, int b)
    {
        int c = a;
        a = b;
        b = c;
        System.out.println("In call_by_value\na = " + a + " b = " + b);
    }

    static void call_by_ref(int ar, Integer br)
    {
        int a = ar, b = br, c;
        ar = br;
        c = a;
        a = b;
        b = c;
        System.out.println("In call_by_ref\na = " + a + " b = " + b);
    }

    public static void main(String[] args)
    {
        int a = 10, b = 20;
        System.out.println("In Main\na = " + a + " b = " + b);
        Integer a_ref = new Integer(10);
        Integer b_ref = new Integer(20);
        call_by_value(a, b);
        call_by_ref(a_ref, b_ref);
        System.out.println("Again, in Main\na = " + a_ref + " b = " + b_ref);

    }

}