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<?xml version="1.0"?>
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<!--
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Copyright 2002-2005 The Apache Software Foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<document>
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<properties>
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<title>Home</title>
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<author email="commons-dev@jakarta.apache.org">Commons Documentation Team</author>
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</properties>
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<body>
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<!-- ================================================== -->
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<section name="Commons Collections">
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<p>
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The <a href="http://java.sun.com/products/j2se/1.4/docs/guide/collections/">Java Collections Framework</a>
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was a major addition in JDK 1.2.
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It added many powerful data structures that accelerate development of most significant Java applications.
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Since that time it has become the recognised standard for collection handling in Java.
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</p>
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<p>
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Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.
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There are many features, including:
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<ul>
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<li>Bag interface for collections that have a number of copies of each object</li>
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<li>Buffer interface for collections that have a well defined removal order, like FIFOs</li>
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<li>BidiMap interface for maps that can be looked up from value to key as well and key to value</li>
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<li>MapIterator interface to provide simple and quick iteration over maps</li>
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<li>Type checking decorators to ensure that only instances of a certain type can be added</li>
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<li>Transforming decorators that alter each object as it is added to the collection</li>
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<li>Composite collections that make multiple collections look like one</li>
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<li>Ordered maps and sets that retain the order elements are added in, including an LRU based map</li>
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<li>Identity map that compares objects based on their identity (==) instead of the equals method</li>
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<li>Reference map that allows keys and/or values to be garbage collected under close control</li>
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<li>Many comparator implementations</li>
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<li>Many iterator implementations</li>
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<li>Adapter classes from array and enumerations to collections</li>
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<li>Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure</li>
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</ul>
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</p>
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</section>
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<!-- ================================================== -->
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<section name="Documentation">
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<p>
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A getting started<span> </span><a href="userguide.html">User's Guide</a> is available
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as are various <a href="maven-reports.html">project reports</a>.
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</p>
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<p>
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The JavaDoc API documents are available online:
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</p>
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<ul>
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<li>The <a href="api-release/index.html">current release 3.1</a></li>
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<li>The <a href="api-2.1.1/index.html">previous version 2.1.1</a></li>
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<li>The <a href="apidocs/index.html">latest SVN</a></li>
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</ul>
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<p>
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The <a href="cvs-usage.html">subversion repository</a> can be
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<a href="http://svn.apache.org/viewcvs.cgi/jakarta/commons/proper/collections/trunk/">browsed</a>.
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</p>
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</section>
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<!-- ================================================== -->
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<section name="Releases">
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<p>
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The latest version is v3.1. -
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<a href="http://jakarta.apache.org/site/downloads/downloads_commons-collections.cgi">Download now!</a><br />
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<!--The <a href="upgradeto3_2.html">upgrade notes</a> are also available.-->
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</p>
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<p>
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For previous releases, see the <a href="http://archive.apache.org/dist/jakarta/commons/collections/">Apache Archive</a>
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</p>
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</section>
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<!-- ================================================== -->
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<section name="Support">
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<p>
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The <a href="mail-lists.html">commons mailing lists</a> act as the main support forum.
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The user list is suitable for most library usage queries.
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The dev list is intended for the development discussion.
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Please remember that the lists are shared between all commons components,
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so prefix your email by [collections].
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</p>
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<p>
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Issues may be reported via <a href="issue-tracking.html">ASF Bugzilla</a>.
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Please remember that Bugzilla is shared between all commons components,
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so prefix your issue by [collections].
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</p>
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</section>
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<!-- ================================================== -->
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</body>
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</document>
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