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("
After swapping... "); System.out.println("firstNum: " + firstNum); System.out.println("secondNum: " + secondNum); }}/*
Expected output:
[root@mypc]# java Swap2NumbersBefore swapping...firstNum: 10secondNum: 20After swapping...firstNum: 20secondNum: 10*/
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