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copied!<p>In my opinion the better choice is <a href="https://github.com/google/guava" rel="noreferrer"><strong>Guava</strong></a> (formerly known as Google collections):</p> <ul> <li>it's more modern (has generics)</li> <li>it absolutely follows the Collections API requirements</li> <li>it's actively maintained</li> <li><a href="https://google.github.io/guava/releases/snapshot/api/docs/com/google/common/cache/CacheBuilder.html" rel="noreferrer"><code>CacheBuilder</code></a> and it's predecessor <a href="https://google.github.io/guava/releases/snapshot/api/docs/com/google/common/collect/MapMaker.html" rel="noreferrer"><code>MapMaker</code></a> are just plain awesome</li> </ul> <p>Apache Commons Collections is a good library as well, but it has long failed to provide a generics-enabled version (which is a <em>major</em> drawback for a collections API in my opinion) and generally seems to be in a maintenance/don't-do-too-much-work-on-it mode <sub>Recently Commons Collections has picked up some steam again, but it has some catching up to do.</sub>.</p> <p>If download size/memory footprint/code size is an issue then Apache Commons Collections might be a better candidate, since it is a common dependency of other libraries. Therefore using it in your own code as well could potentially be done without adding any additional dependencies. Edit: This particular "advantage" has been partially subverted by now, since many new libraries actually depend on Guava and <em>not</em> on Apache Commons Collections.</p>

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