Write a program to swap two numbers?

package com.instanceofjava;

public class SwapTwoNumbers{

public static void main(String args[]){
        int x =10;

        int y =20

        System.out.println("Before swaping:");

        System.out.println("x value is: "+x);

        System.out.println("y value is: "+y);

        x = x+y;

        y=x-y;

        x=x-y;

        System.out.println("After swaping:");

        System.out.println("x value is: "+x);

        System.out.println("y value is: "+y);

    }

}

Output:
Before swaping:
x value is :10
y value is:20

After swaping:
x value is :20
y value is :10