Java Program to Swap Two Numbers

Posted in Java Tutorial

Updated on Nov 16, 2024

By Mari Selvan

👁️ 74 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the world of programming, performing basic operations on numbers is a fundamental task. Swapping two numbers is one such operation that involves exchanging the values of two variables. This operation is commonly used in various algorithms and programs.

In this tutorial, we will explore a simple Java program designed to swap the values of two numbers.

📄 Example

Let's delve into the Java code that accomplishes this task.

SwapNumbers.java

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import java.util.Scanner;

public class SwapNumbers {
  // Function to swap two numbers
  static void swapNumbers(int[] arr) {
    // Ensure that the array has exactly two elements
    if (arr.length == 2) {
      // Swap the elements using a temporary variable
      int temp = arr[0];
      arr[0] = arr[1];
      arr[1] = temp;
    } else {
      System.out.println("Array must have exactly two elements.");
    }
  }

  // Driver program
  public static void main(String[] args) {
    // Replace these values with the numbers you want to swap
    int[] numbers = {
      5,
      10
    };

    System.out.printf("Before swapping: num1 = %d, num2 = %d%n", numbers[0], numbers[1]);

    // Call the function to swap the numbers
    swapNumbers(numbers);

    System.out.printf("After swapping: num1 = %d, num2 = %d%n", numbers[0], numbers[1]);
  }
}

💻 Testing the Program

To test the program with different numbers, modify the values of the numbers array in the main method.

Output

Before swapping: num1 = 5, num2 = 10
After swapping: num1 = 10, num2 = 5

Compile and run the program to see the result of swapping the two numbers.

🧠 How the Program Works

The program defines a class SwapNumbers containing a static method swapNumbers that takes an array of integers as a parameter and swaps the values of the two elements in the array.
Inside the main method, replace the values of the numbers array with the numbers you want to swap.
The program prints the values of the two numbers before and after swapping.

🧐 Understanding the Concept of Swapping Two Numbers

Swapping two numbers involves exchanging their values. In the provided program, a temporary variable is used to hold the value of one variable while the values of the two variables are exchanged.