Java Program to Swap Two Numbers
Using Temporary Variable

Last Updated: 13 August, 2022

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On this tutorial page we are going to learn how to write a Java program to swap two numbers using a temporary variable.

We can swap two numbers using a temporary variable as follows :

temp = num1;
num1 = num2;
num2 = temp;

Here, we first assign num1 to the temp variable, then num2 to num1, and finally temp to num2.

Let's see the given examples below:

Program 1: Swap two numbers using a temporary variable in Java

public class SwapTwoNumbers { public static void main(String[] args) { int num1 = 10; // First Number int num2 = 20; // Second Number int temp; System.out.println("Before swapping numbers ---"); System.out.println("First number: " + num1); System.out.println("Second number: " + num2); // num1 value is assigning into the temp variable temp = num1; // Value of num2 is assigned into num1 num1 = num2; // temp variable value which is actually is num1 value is assigning into num2 num2 = temp; System.out.println("\nAfter swapping numbers ---"); System.out.println("First number = " + num1); System.out.println("Second number = " + num2); } }

Output

Before swapping numbers ---
First number: 10
Second number: 20

After swapping numbers ---
First number = 20
Second number = 10

Program 2: Swap two numbers using a temporary variable in Java with user input

import java.util.Scanner; public class SwapTwoNumbers { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter First Number: "); int num1 = scanner.nextInt(); System.out.print("Enter Second Number: "); int num2 = scanner.nextInt(); int temp; scanner.close(); // num1 value is assigning into the temp variable temp = num1; // Value of num2 is assigned into num1 num1 = num2; // temp variable value which is actually is num1 value is assigning into num2 num2 = temp; System.out.println("\nAfter swapping numbers ---"); System.out.println("First number = " + num1); System.out.println("Second number = " + num2); } }

Output

Enter First Number: 1500
Enter Second Number: 3000

After swapping numbers ---
First number = 3000
Second number = 1500