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<?xml version="1.0"?>
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<document>
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<properties>
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<title>Commons</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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<section name="The Collections Component">
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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 regognised standard for collection handling in the Java language.
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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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<section name="Documentation">
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<p>
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A getting started <a href="userguide.html">User's Guide</a> is available.
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</p>
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<p>
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The JavaDoc API documents are available online for the
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<a href="api-30/index.html">current release 3.0</a>, the
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<a href="api-21/index.html">previous version 2.1</a>, and the
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<a href="apidocs/index.html">latest CVS</a>.
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</p>
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<p>
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The <a href="http://cvs.apache.org/viewcvs/jakarta-commons/collections/">CVS repository</a> can be browsed.
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</p>
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</section>
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2004-01-05 19:44:20 -05:00
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<section name="Releases">
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<p>
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Version 3.0 -
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<a href="http://jakarta.apache.org/site/binindex.cgi">Binary</a> -
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<a href="http://jakarta.apache.org/site/sourceindex.cgi">Source</a>
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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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</body>
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</document>
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