class demo { public static void main(string arg[]) { System.out.println("Before swapping"); int x = 10; int y = 20; System.out.println("value of x:" + x); System.out.println("value of y:" + y); system.out.println("After swapping"); x = x + y; y = x - y; x = x - y; System.out.println("value of x:" + x); System.out.println("value of y:" + y); } }