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    <p>Guava has <a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/collect/Lists.html#transform%28java.util.List,%20com.google.common.base.Function%29" rel="nofollow noreferrer"><code>Lists.transform</code></a> that can transform a <code>List&lt;F&gt;</code> to a <code>List&lt;T&gt;</code>, using a provided <a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/base/Function.html" rel="nofollow noreferrer"><code>Function&lt;F,T&gt;</code></a> (or rather, <code>Function&lt;? super F,? extends T&gt;</code>).</p> <p>From the documentation:</p> <blockquote> <pre><code>public static &lt;F,T&gt; List&lt;T&gt; transform( List&lt;F&gt; fromList, Function&lt;? super F,? extends T&gt; function ) </code></pre> <p>Returns a list that applies <code>function</code> to each element of <code>fromList</code>. The returned list is a transformed view of <code>fromList</code>; changes to <code>fromList</code> will be reflected in the returned list and vice versa.</p> <p>The <code>function</code> is applied lazily, invoked when needed.</p> </blockquote> <p>Similar live-view transforms are also provided as follows:</p> <ul> <li><a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/collect/Iterables.html#transform%28java.lang.Iterable,%20com.google.common.base.Function%29" rel="nofollow noreferrer"><code>Iterables.transform</code></a> (<code>Iterable&lt;F&gt;</code> to <code>Iterable&lt;T&gt;</code>)</li> <li><a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/collect/Iterators.html#transform%28java.util.Iterator,%20com.google.common.base.Function%29" rel="nofollow noreferrer"><code>Iterators.transform</code></a> (<code>Iterator&lt;F&gt;</code> to <code>Iterator&lt;T&gt;</code>)</li> <li><a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/collect/Collections2.html#transform%28java.util.Collection,%20com.google.common.base.Function%29" rel="nofollow noreferrer"><code>Collections2.transform</code></a> (<code>Collection&lt;F&gt;</code> to <code>Collection&lt;T&gt;</code>)</li> <li><a href="http://guava-libraries.googlecode.com/svn-history/r13/trunk/javadoc/com/google/common/collect/Maps.html#transformValues%28java.util.Map,%20com.google.common.base.Function%29" rel="nofollow noreferrer"><code>Maps.transformValues</code></a> (<code>Map&lt;K,V1&gt;</code> to <code>Map&lt;K,V2&gt;</code>)</li> </ul>
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    1. POGetting a list of elements from an ArrayList
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    1. COCool, good to see a link to a library that does essentially what I was suggesting in my post.
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    2. CO@Mark: the big difference is that Guava's implementation applies the function on-demand. Sort of "lazy transform", where as yours is eager.
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    3. COAh, I was curious as to why they were specifically using iterable. That explains the reasoning. I like it even more now (assuming there's a factory method in Guava to create a collection from an iterable?)
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