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copied!<ul> <li>I don't see where you create a new instance of the <code>char</code> array. Any reference to it will generate a <code>NullPointerException</code></li> <li>I don't see the declaration or implementation of <code>ArrayList.insertEnd(..)</code> which would generate a compilation error, so I'm assuming you have not included it here (same goes for <code>deleteEnd</code> and <code>expandByTen</code> etc).</li> <li>Assuming you are creating the <code>char[]</code> instance somewhere with the length defined in the constructor, you set the size equal to 10 if the constructor argument is less than or equal to zero. In the <code>main</code> method, you instantiate an instance of <code>ArrayList</code> with a size of -1, which should (based on what little you have provided) create (somewhere) an instance of the <code>list</code> field with a size of 10. However, your first loop attempts to make 15 iterations, which will generate an <code>IndexOutOfBounds</code> exception at runtime if you aren't doing appropriate bounds checking in the <code>insertEnd</code> method.</li> </ul> <p>I'm going out on a limb and guessing you are doing this as an assignment for school? If not, be aware that Java has a whole plethora of containers, including <a href="http://docs.oracle.com/javase/7/docs/api/index.html?java/util/ArrayList.html" rel="nofollow"><code>java.util.ArrayList</code></a>, in the <a href="http://docs.oracle.com/javase/7/docs/api/java/util/package-summary.html" rel="nofollow"><code>java.util</code></a> package. </p>

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