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copied!<p>Take a look at <a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html" rel="nofollow">the JavaDocs for List</a>.</p> <p>A lot of them have lines like this, showing that they're from the <code>Collection</code> interface:</p> <blockquote> <p>Specified by:</p> <pre><code>size in interface Collection<E> </code></pre> </blockquote> <p>The ones with no "specified by" section are:</p> <pre><code>E get(int index) E set(int index, E element) void add(int index, E element) E remove(int index) int indexOf(Object o) int lastIndexOf(Object o) ListIterator<E> listIterator() ListIterator<E> listIterator(int index) List<E> subList(int fromIndex, int toIndex) </code></pre> <p>Where <code>E</code> is the <code>Type</code> specified in <code>List<Type></code>.</p> <p>Basically, it's a bunch of things related to indexes -- because not all <code>Collections</code> have an index, or an order at all for that matter, and a couple related to special iterators, and <code>subList</code>.</p> <p>The advantage to using <code>Collection</code> in method signatures is that you don't force your users to use one kind of collection (some users can use a <code>Set</code>, some can use a <code>List</code>, etc.). This only makes sense if you don't need the methods that `List gives you.</p> <p>In this example, I'm not using any <code>List</code>-specific methods:</p> <pre><code>/** * Simple example, adds "1" to the Collection */ public static void addOne(Collection in) { in.add(1); } </code></pre> <p>There's no reason to force users of this method to only pass it a list, because the only method we're calling on it (<code>add</code>) is available in all <code>Collection</code>s.</p>

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