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POSimple Java App to calculate the average of an indefinite amount of entered numbers
 

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  1. POSimple Java App to calculate the average of an indefinite amount of entered numbers
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    <p>I am completely new to Java and have an assignment coming up; with the brief being the following:</p> <p><em>A Swing interface. The application must allow the user to enter some data and click a button. The application must have an event handler to react to the click button event. The application must perform some operation on the data entered. The application must return the modified data to the user.</em></p> <p>I was originally going to create an app that converted numbers to different units (eg. kgs to lbs) but found it very difficult, so have decided to go for an app which finds the average of a number of inputs.</p> <p>This is the code i have for finding the average of a pre-defined array:</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; class FindAverageNumber extends JFrame { public static void main(String[] args){ double numbers[] = new double[]{1,2,3,4,5,6,7,8,9,20}; double average = 0; double cumulative = 0; for (int i=0; i&lt;numbers.length; i++){ double selected = numbers[i]; cumulative = (cumulative + selected); } average = (cumulative / numbers.length); System.out.println("The average of the array is: "+average); } } </code></pre> <p>The code seems to function properly but, being new to Java, i don't know how to take in these numbers from the user while also incorporating a swing interface (which i'm lost on). I'm assuming accepting an array is the best way to do this, with the user being presented with a textfield. I don't know how to separate the inputs up into their own index in the array. </p> <p>I'd appreciate any help; i realise i have a lot of basic questions.</p>
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    1. COIf you need to make a swing, you should look into Netbeans IDE. They have a good swing maker where you would just drag and drop the components you need, create the event handler, etc. If you don't mind me asking, what did you find difficult about the unit conversion question? Was it math related or were you having problems with the swing aspect like you are now?
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    2. COI actually am using Netbeans. Like Java, i'm very new to it. My problem with the converter was i think it is just over my head - adding things like a dropdown list to select things like weight, length, time, temperature etc....another for the specific unit to convert from, kg, lb, sec, hrs etc....a textfield for the user to input the quantity, another dropdown list for the unit to convert to. These are all things i don't know how to do. I feel i could write out the pseudocode with no problem but i'm pretty useless when it comes to the proper coding
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    3. COSee also this [example](http://stackoverflow.com/a/8703807/230513).
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