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    <p>As a <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Stack.html" rel="nofollow"><code>Stack</code></a> is a <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Collection.html" rel="nofollow"><code>Collection</code></a> it implements <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Collection.html#toArray%28T%5b%5d%29" rel="nofollow">the <code>toArray(T[])</code> method</a> so you could use that to convert your stack to an array and use your working array solution.</p> <p>However, you will have the problem that there is no autoboxing for arrays. Autoboxing automatically converts between primitive types and objects which means, for example, you can add <code>int</code> values directly to your <code>Stack</code> without creating <code>Integer</code> objects, as the compiler does this for you:</p> <pre><code>Stack&lt;Integer&gt; stack = new Stack&lt;Integer&gt;(); stack.push(20); stack.push(53); </code></pre> <p>However, the compiler won't convert between <code>int[]</code> and <code>Integer[]</code> so you'd have to do:</p> <pre><code>Integer[] array = stack.toArray(new Integer[stack.size()]); </code></pre> <p>And using <code>Integer[]</code> would be a chore. </p> <p>So the easiest thing to do is this:</p> <pre><code>int[] array = new int[stack.size()]; for (int i = 0; i &lt; array.length; i++) { array[i] = stack.get(i); } </code></pre> <p>Creating an array once will be more efficient than repeatedly cloning and emptying a Stack.</p> <p>(Although if this is a homework question intended to teach you how to use stacks this might not be the best approach!)</p>
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