JAVA Help

import java.util.*;
class swap
{
    public static void main()
    {
        Scanner s=new Scanner (System.in);
        System.out.println("Enter 2 integer type numbers");
        int a=s.nextInt();
        int b=s.nextInt();
        System.out.println("Before Swapping A="+a);
        System.out.println("Before Swapping B="+b);
        a=a+b;
        b=a-b;
        a=a-b;
        System.out.println("After Swapping A="+ a);
        System.out.println("After Swapping B="+ b);
    }
}