SwapNumbersWithoutThirdVariable - JAVA

public class SwapNumbersWithoutThirdVariable {
  
 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("After Swapping");
  System.out.println("Value of num1 is :" + num1);
  System.out.println("Value of num2 is :" +num2);
 }
 
 
}