Swap two variables without using third variable in Java

        In this post, we will discuss and write code to swap two variables without using a third (temporary) variable. The first example demonstrates swapping two integers without using a third variable, and the second example demonstrates swapping two strings without using a third variable.

1) Swapping two integers without using temporary variable

SwapIntegers.java,

package com.example.demo;

public class SwapIntegers {
 
       public static void main(String[] args) {
  

                int a = 12;
                int b = 20;
                a = a + b;
                b = a - b;
                a = a - b;
                System.out.println("After Swapping, a = " +a+" and b = "+b);
      }
}

Output:-
After Swapping, a = 20 and b = 12


2) Swapping two string variables without using temporary variable

SwapStrings.java

package com.example.demo;

public class SwapStrings {
 
        public static void main(String[] args) {
  
               String var1 = "Java";
               String var2 = "PHP";
               var1 = var1 + var2;
               var2 = var1.substring(0, var1.length() - var2.length());
               var1 = var1.substring(var2.length());
               System.out.println("After swapping, var1 - "+var1+" var2 - "+var2);
       }
}

Output:-
After swapping, var1 - PHP var2 - Java


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