ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Programming in Java Netbeans - A Step by Step Tutorial for Beginners: Lesson 14

Updated on October 16, 2019
dwachira profile image

Danson Wachira is a certified Trainer in Computer Science, Information Technology and related studies.

Lesson 14: Manipulating Java arrays using loops

In lesson 13, we learnt how we can define an array in Java programming language and how we can assign values into the array. To assign values, we used the following statement:

myNums[2] = 14;

The above statement of assigning values into an array will work best only if we have fewer values to store in the array, but what if we have many values, say over a 100 number of values? It will be tedious to use such a statement of assigning values one value by one. To simplify our programming, we introduce the loops that we learnt in the previous lessons; FOR, DO…WHILE and WHILE loops.


FOR loop and Arrays in Java

If you want to store consecutive numbers in the array, you need to know how many positions are there in the array.

You don’t want to assign a value to non-existing position in the array. To establish the number of position in the array, we use a property of the array called Length.

We’ll write another program to store multiples of 10 from 1-50 into an array. Go to the NetBeans code window, create a new Java class, call it loopsArrays. Type the code as shown below and run.


Here, we have defined our array to have 50 positions, we have then looped through the array and for every loop we multiply the value of counter i by 10 and store the value into the array. The last statement inside the FOR loop is for outputting the values of the array on console.

WHILE loop and Arrays in Java

Let us try the same example with a WHILE loop. Copy and Paste the code as shown below and run.

Java program using WHILE loop and Arrays

package myfirstprogram;

public class loopsArray {
     public static void main(String[] args) {
         int[] myNums;
         myNums = new int[50];  //Define an array of size 50
         System.out.println("Array values are:");
         int i=1;
               myNums[i]=i*10; //Multiply i by 10 to get multiples of 10
               System.out.print(myNums[i]+"," );  //Output array values

DO…WHILE loop and Arrays in Java


Modify the above example to work with the DO…WHILE loop. If you have problem with the loop, re-visit Lesson 12 where we learnt about DO…WHILE loop. In the next lesson, we shall look at how we can sort values in an array, see you then.

<< Lesson 13 | Lesson 15 >>


    0 of 8192 characters used
    Post Comment
    • profile image


      8 years ago

      This is a nice tutorial with very easy to follow instructions, thanks

    • dwachira profile imageAUTHOR

      Danson Wachira 

      8 years ago from Nairobi, Kenya

      I like the suggestions here Lord De Cross, i will surely do those reviews. Thanks for the visit and comment. Enjoy your day!

    • Lord De Cross profile image

      Joseph De Cross 

      8 years ago from New York

      I took some C++, So I can see where is heading this programming into. You probably know about pythom and SQL. Great review Dwachira! Now where we will see html6.0 and C+++?


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, 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:

    Show Details
    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 or domains, for performance and efficiency reasons. (Privacy Policy)
    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)
    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.
    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)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)