ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

How to swap two numbers in Java passed from console ?

Updated on September 17, 2014

The following code is a simple Java program which swaps two numbers. It reads two integers from the console. After swapping, it prints result on the console. This is just a simple program which illustrates working of many features of Java programming language. In this application, there is one class named as 'SwapDemo'. This class contains a method named as main. It’s the starting point for any application to execute. I will also provide you with the source code below. Here is the code :

package com.hubpages.swap.example;

import java.util.Scanner;

public class SwapDemo {

	public static void main(String[] args) {

		// Create a Scanner object which will read 
		// values from the console which user enters
		Scanner scanner = new Scanner(System.in);

		System.out.println("Enter value of number 1 ");
		int num1 = scanner.nextInt();

		System.out.println("Enter value of number 2 ");
		int num2 = scanner.nextInt();

		// Lets print the value of two numbers before 
		// swapping them 
		System.out.println("Before Swapping of the numbers : ");

		System.out.println("Value of num1 is :" + num1);
		System.out.println("Value of num2 is :" +num2);

		// passing the values to a static method which will
		// perform the swapping of number for us 
		swapNumbers(num1, num2);
	}

	private static void swapNumbers(int number1, int number2) {

		// We will create a temp variable which will store the one of 
		// the value for us say either number1 or number2
		int temp = number1;

		// number1 value is stored into the temp variable, so its stored
		// somewhere in the variable, we now store value of number2 in
		// to number1 for performing the swapping
		number1 = number2;

		// Finally, we store the value of temp into variable 
		// number2 thus reversing the numbers 		
		number2 = temp;

		// Lets print the value of two numbers after 
		// swapping them 
		System.out.println();
		System.out.println("After Swapping of the numbers : ");
		System.out.println("Value of num1 is :" + number1);
		System.out.println("Value of num2 is :" +number2);

	}
}

Steps to implement

Step 1 :- Create a Scanner object which will read values from the console which user enters.

Step 2 :- Prompt user to enter number1 and number2.

Step 3 :- Print the numbers before swapping them.

Step 4 :- Passing the values to a static method which will perform the swapping of numbers.

Step 5 :- In the swapNumbers method, We will create a temp variable which will store the one of the value for us say either number1 or number2.

Step 6 :- number1 value is stored into the temp variable, so its stored somewhere in the variable, we now store value of number2 into number1 for performing the swap.

Step 7 :- Finally, we store the value of temp into variable number2 thus reversing the numbers.

Step 8 :- Print the numbers on the console after swapping.

 

Video Tutorial : Swapping of two numbers in Java

Output of the program :

Comments

    0 of 8192 characters used
    Post Comment

    No comments yet.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)