Java Program to Swap two Numbers - The Coding Shala

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 In this post, we will learn How to Swap Two Numbers in Java.

Swap Two Numbers in Java

We have to write a Java program to swap the values of the given two numbers.

Example:

Input:

num1: 10

num2: 20

Output:

num1 = 20

num2 = 10

Approach 1

Using temporary variable.

Java Program: 

public class Solution {
	public static void main(String[] args) {
		int num1 = 10;
		int num2 = 20;
		System.out.println("Before Swapping");
		System.out.println("First Number: " + num1);
		System.out.println("Second Number: " + num2);
		
		//swap
		int temp = num1;
		num1 = num2;
		num2 = temp;
		
		System.out.println("-----------");
		System.out.println("After Swapping");
		System.out.println("First Number: " + num1);
		System.out.println("Second Number: " + num2);
	}
}

Output:

Before Swapping
First Number: 10
Second Number: 20
-----------
After Swapping
First Number: 20
Second Number: 10

Approach 2

Without using a temporary variable.

Java Program: 

public class Solution {
	public static void main(String[] args) {
		int num1 = 10;
		int num2 = 20;
		System.out.println("Before Swapping");
		System.out.println("First Number: " + num1);
		System.out.println("Second Number: " + num2);
		
		//swap
		num1 = num1 - num2;
		num2 = num1 + num2;
		num1 = num2 - num1;
		
		System.out.println("-----------");
		System.out.println("After Swapping");
		System.out.println("First Number: " + num1);
		System.out.println("Second Number: " + num2);
	}
}

Output:

Before Swapping
First Number: 10
Second Number: 20
-----------
After Swapping
First Number: 20
Second Number: 10

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