commons-collections/README.md

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Apache Commons Collections
===================

[![Build Status](https://travis-ci.org/apache/commons-collections.svg)](https://travis-ci.org/apache/commons-collections)
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[![Javadocs](https://javadoc.io/badge/org.apache.commons/commons-collections4/4.4.svg)](https://javadoc.io/doc/org.apache.commons/commons-collections4/4.4)
[![CodeQL](https://github.com/apache/commons-collections/workflows/CodeQL/badge.svg)](https://github.com/apache/commons-collections/actions/workflows/codeql-analysis.yml?query=workflow%3ACodeQL)

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
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-collections4</artifactId>
  <version>4.4</version>
</dependency>
```

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```.

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