Apache Commons Collections =================== [](https://travis-ci.org/apache/commons-collections) [](https://coveralls.io/r/apache/commons-collections) [](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-collections4/) [](https://javadoc.io/doc/org.apache.commons/commons-collections4/4.4) The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. Documentation ------------- More information can be found on the [Apache Commons Collections homepage](https://commons.apache.org/proper/commons-collections). The [Javadoc](https://commons.apache.org/proper/commons-collections/apidocs) 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 4.4 ``` Contributing ------------ We accept Pull Requests 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 ------- This code is under the [Apache License v2](https://www.apache.org/licenses/LICENSE-2.0). See the `NOTICE.txt` file for required notices and attributions. 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 Issue Tracker (JIRA)](https://issues.apache.org/jira/browse/COLLECTIONS) + [Apache Commons Twitter Account](https://twitter.com/ApacheCommons) + `#apache-commons` IRC channel on `irc.freenode.org` [ml]:https://commons.apache.org/mail-lists.html