Swapping two numbers without using third variable [Method 2]

/**
 * The class Swapping_Method2 takes 2 numbers as input and swaps their value without using any 3rd variable
 * This is Method 2
 * @author : www.guideforschool.com
 * @Program Type : BlueJ Program - Java
 */

import java.util.Scanner;
class Swapping_Method2
    {
        public static void main(String args[])
        {
        Scanner sc = new Scanner(System.in);
            int a,b;
            System.out.print("Enter the 1st no: ");
            a=sc.nextInt();
            System.out.print("Enter the 2nd no: ");
            b=sc.nextInt();

            System.out.println("-------------------------------");
            System.out.println("The numbers before swapping are");
            System.out.println("a = "+a);
            System.out.println("b = "+b);

            //Beginning of Swapping
            a=a+b;
            b=a-b;
            a=a-b;

            //End of Swapping
            System.out.println("-------------------------------");
            System.out.println("The numbers after swapping are");
            System.out.println("a = "+a);
            System.out.println("b = "+b);
        }
    }