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POHow to organize strings through a sort method
 

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  1. POHow to organize strings through a sort method
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    <p>This is a program that lets user input 6 random letters, and the program sorts these letters in order. Ex user inputs j, d, e, l, w, q and program outputs d, e, j, l, q, w.</p> <p>Unfortunately the code freaks out and does not sort a thing. Note: I am using a GUI</p> <p>Under public I created a class and an array to eventually house all inputted letters</p> <pre><code>class Abc { String letter; Abc (String _letter) { letter = _letter; } } ArrayList &lt;Abc&gt; alphabet = new ArrayList &lt;Abc&gt;(3); //note its 3, not 6 like in the example </code></pre> <p>After user types in a letter in a textField, they press the "addButton" which adds and saves the value in the array.</p> <pre><code>String letter = letterField.getText(); //Store values in array Abc a = new Abc(letter); alphabet.add(a); </code></pre> <p>Now for the actual 'sorting' part. Which takes place after user presses a "Play" button.</p> <pre><code>String[] abc = new String[3]; //LINE I FORGOT TO ADD for (int k = 0; k &lt; abc.length; k++) { abc[k] = letterField.getText(); int x; for (int i = 0; i &lt; abc.length; i++) { // Asume first value is x x = i; for (int j = i + 1; j &lt; abc.length; j++) { //find smallest value in array (random) if (abc[j].compareToIgnoreCase(abc[x]) &lt; 0) { x = j; } } if (x != i) { //swap the values if not in correct order final String temp = abc[i]; abc[i] = abc[x]; abc[x] = temp; } textArea.append(abc[i] + "\n");// Output correct order } } </code></pre> <p>I had originally used this code to sort integers, the only difference between that program and this program is the int/String and this one I am currently working on allows the user to input the letters and the program does not randomize them like it did with the integer program. </p> <p>I had thought this would be enough code to do the trick and organize some letters, but apparently not.</p> <p>For the actually problem, when I input the letters and add them to the array and press "play" the program freaks and a lovely error pops up...</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "d" </code></pre> <p>Note: 'd' being the last letter I inputted for the last time I tested the program...all of five seconds ago.</p> <p>Any hints or advice would be greatly appreciated! </p>
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    1. COHint: Google `NumberFormatException`. And check for a line number.
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    2. COyour error is not in the code u show, and u are doing a for loop setting always the same value `abc[k] = letterField.getText();` besides if u declared ur array with null values it would throw a nullPointerException ..
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