val_ref

import java.util.Scanner;

class Vari
{
    int a, b;

    void swap(Vari ob)
    {
        int c = ob.a;
        ob.a = ob.b;
        ob.b = c;
        System.out.print("\n\nIn swap by ref\n a = "+ ob.a + " b = "+ ob.b);
    }

    void swap(int a, int b)
    {
        int c = a;
        a = b;
        b = c;
        System.out.print("\n\nIn swap by value\n a = "+ a + " b = "+ b);
    }
}



public class val_ref {


    public static void main(String[] args)
    {

        Vari ob1 = new Vari();
        ob1.a = 10;
        ob1.b = 20;
        System.out.print("\nIn Main\n a = " + ob1.a + " b = " + ob1.b);
        ob1.swap(ob1.a, ob1.b);
        System.out.print("\n\nIn Main\n a = " + ob1.a + " b = " + ob1.b);
        ob1.swap(ob1);

        System.out.println("\n\nAgain, in Main\n a = " + ob1.a + " b = " + ob1.b);

    }

}