Apache Commons Collections =================== [](https://travis-ci.org/apache/commons-collections) [](https://coveralls.io/github/apache/commons-collections?branch=trunk) [](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-collections4/) [](http://www.apache.org/licenses/LICENSE-2.0.html) The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. Documentation ------------- More information can be found on the [homepage](https://commons.apache.org/proper/commons-collections). The [JavaDoc](https://commons.apache.org/proper/commons-collections/javadocs/api-release) can be browsed. Questions related to the usage of Apache Commons Collections should be posted to the [user mailing list][ml]. Where can I get the latest release? ----------------------------------- You can download source and binaries from our [download page](https://commons.apache.org/proper/commons-collections/download_collections.cgi). Alternatively you can pull it from the central Maven repositories: ```xml org.apache.commons commons-collections4 4.1 ``` Contributing ------------ We accept PRs via github. The [developer mailing list][ml] is the main channel of communication for contributors. There are some guidelines which will make applying PRs easier for us: + No tabs! Please use spaces for indentation. + Respect the code style. + Create minimal diffs - disable on save actions like reformat source code or organize imports. If you feel the source code should be reformatted create a separate PR for this change. + Provide JUnit tests for your changes and make sure your changes don't break any existing tests by running ```mvn clean test```. If you plan to contribute on a regular basis, please consider filing a [contributor license agreement](https://www.apache.org/licenses/#clas). You can learn more about contributing via GitHub in our [contribution guidelines](CONTRIBUTING.md). License ------- Code is under the [Apache Licence v2](https://www.apache.org/licenses/LICENSE-2.0.txt). Donations --------- You like Apache Commons Collections? Then [donate back to the ASF](https://www.apache.org/foundation/contributing.html) to support the development. Additional Resources -------------------- + [Apache Commons Homepage](https://commons.apache.org/) + [Apache Bugtracker (JIRA)](https://issues.apache.org/jira/) + [Apache Commons Twitter Account](https://twitter.com/ApacheCommons) + #apachecommons IRC channel on freenode.org [ml]:https://commons.apache.org/mail-lists.html