Tip: Swapping Two Numbers

Swapping two numbers without using a new variable is always a good approach. This helps your application to be memory and performance oriented.

public class Swap2Numbers
{
   int firstNum = 10;
   int secondNum = 20;
   
   public static void main(String args[])
   {
      Swap2Numbers swap2Numbers = new Swap2Numbers();
      swap2Numbers.proceed();
   }
   
   private void proceed()
   {
      System.out.println("Before swapping... ");
      System.out.println("firstNum: " + firstNum);
      System.out.println("secondNum: " + secondNum);
      
      firstNum = firstNum + secondNum;
      secondNum = firstNum - secondNum;
      firstNum = firstNum - secondNum;

      System.out.println("\nAfter swapping... ");
      System.out.println("firstNum: " + firstNum);
      System.out.println("secondNum: " + secondNum);
      
   }
}

/*

Expected output:

[root@mypc]# java Swap2Numbers
Before swapping...
firstNum: 10
secondNum: 20

After swapping...
firstNum: 20
secondNum: 10

*/

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