How do I reset an iterator in Java?
<p>Below, I have an iterator for a collection named <code>Sigma</code>. How do I reset the iterator to its first element when the <code>while</code> loop completes?</p>

<pre><code>Iterator it = Sigma.iterator();

while (it.hasNext()) {
    letter = (String)it.next();
    System.out.println(letter);
}
</code></pre>