Swap Numbers without using third variable

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package com.kota.java; public class SwapNumbers { public static void main(String[] args) { int num1 = 10; int num2 = 20; System.out.println("Before Swapping"); System.out.println("Value of num1 is :" + num1); System.out.println("Value of num2 is :" +num2); //add both the numbers and assign it to first num1 = num1 + num2; num2 = num1 - num2; num1 = num1 - num2; System.out.println("Before Swapping"); System.out.println("Value of num1 is :" + num1); System.out.println("Value of num2 is :" +num2); } } /* Output : Before Swapping Value of num1 is :10 Value of num2 is :20 After Swapping Value of num1 is :20 Value of num2 is :10*/