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<h1 title="Package" class="title">Package org.apache.commons.collections</h1>
<div class="docSummary">
<div class="block">
Java Collections Framework extensions.</div>
</div>
<p>See: <a href="#package_description">Description</a></p>
</div>
<div class="contentContainer">
<ul class="blockList">
<li class="blockList">
<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections">Bag</a></td>
<td class="colLast">
<div class="block">A <code>Collection</code> that counts the number of times an object appears in
the collection.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Buffer.html" title="interface in org.apache.commons.collections">Buffer</a></td>
<td class="colLast">
<div class="block">A Buffer is a collection that allows objects to be removed in some
well-defined order.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Closure.html" title="interface in org.apache.commons.collections">Closure</a></td>
<td class="colLast">
<div class="block">An interface to represent some Closure, a block of code which is executed
from inside some block, function or iteration which operates on an input
object.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Factory.html" title="interface in org.apache.commons.collections">Factory</a></td>
<td class="colLast">
<div class="block">Factory
A simple interface that describes the most basic means of having the ability
to create an object.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/MultiMap.html" title="interface in org.apache.commons.collections">MultiMap</a></td>
<td class="colLast">
<div class="block">This is simply a Map with slightly different semantics.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Predicate.html" title="interface in org.apache.commons.collections">Predicate</a></td>
<td class="colLast">
<div class="block">Performs some predicate which returns true or false based on the input object.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/PriorityQueue.html" title="interface in org.apache.commons.collections">PriorityQueue</a></td>
<td class="colLast">
<div class="block">Interface for priority queues.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/SortedBag.html" title="interface in org.apache.commons.collections">SortedBag</a></td>
<td class="colLast">
<div class="block">A type of <a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a> that maintains order among its unique
representative members.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/Transformer.html" title="interface in org.apache.commons.collections">Transformer</a></td>
<td class="colLast">
<div class="block">An object capable of transforming an input object into some output object.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ArrayStack.html" title="class in org.apache.commons.collections">ArrayStack</a></td>
<td class="colLast">
<div class="block">An implementation of the <code>Stack</code> API that is based on an
<code>ArrayList</code> instead of a <code>Vector</code>, so it is not
synchronized to protect against multi-threaded access.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BagUtils.html" title="class in org.apache.commons.collections">BagUtils</a></td>
<td class="colLast">
<div class="block">Provides utility methods and decorators for <a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a>
and <a href="../../../../org/apache/commons/collections/SortedBag.html" title="interface in org.apache.commons.collections"><code>SortedBag</code></a> instances.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BeanMap.html" title="class in org.apache.commons.collections">BeanMap</a></td>
<td class="colLast">
<div class="block">An implementation of Map for JavaBeans which uses introspection to
get and put properties in the bean.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BeanMap.MyMapEntry.html" title="class in org.apache.commons.collections">BeanMap.MyMapEntry</a></td>
<td class="colLast">
<div class="block">Map entry used by <a href="../../../../org/apache/commons/collections/BeanMap.html" title="class in org.apache.commons.collections"><code>BeanMap</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BinaryHeap.html" title="class in org.apache.commons.collections">BinaryHeap</a></td>
<td class="colLast">
<div class="block">Binary heap implementation of <a href="../../../../org/apache/commons/collections/PriorityQueue.html" title="interface in org.apache.commons.collections"><code>PriorityQueue</code></a> and <a href="../../../../org/apache/commons/collections/Buffer.html" title="interface in org.apache.commons.collections"><code>Buffer</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BoundedFifoBuffer.html" title="class in org.apache.commons.collections">BoundedFifoBuffer</a></td>
<td class="colLast">
<div class="block">The BoundedFifoBuffer is a <strong>very</strong> efficient implementation of
Buffer that does not alter the size of the buffer at runtime.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BufferUtils.html" title="class in org.apache.commons.collections">BufferUtils</a></td>
<td class="colLast">
<div class="block">Contains static utility methods for operating on <a href="../../../../org/apache/commons/collections/Buffer.html" title="interface in org.apache.commons.collections"><code>Buffer</code></a> objects.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/CollectionUtils.html" title="class in org.apache.commons.collections">CollectionUtils</a></td>
<td class="colLast">
<div class="block">A set of <code>Collection</code> related utility methods.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ComparatorUtils.html" title="class in org.apache.commons.collections">ComparatorUtils</a></td>
<td class="colLast">
<div class="block">Provides convenient static utility methods for <Code>Comparator</Code>
objects.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/CursorableLinkedList.html" title="class in org.apache.commons.collections">CursorableLinkedList</a></td>
<td class="colLast">
<div class="block">A doubly-linked list implementation of the <code>List</code> interface,
supporting a <code>ListIterator</code> that allows concurrent modifications
to the underlying list.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/DefaultMapBag.html" title="class in org.apache.commons.collections">DefaultMapBag</a></td>
<td class="colLast">
<div class="block">This class provides a skeletal implementation of the <a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a>
interface to minimize the effort required for target implementations.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/DefaultMapEntry.html" title="class in org.apache.commons.collections">DefaultMapEntry</a></td>
<td class="colLast">
<div class="block">A default implementation of <code>Map.Entry</code></div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/DoubleOrderedMap.html" title="class in org.apache.commons.collections">DoubleOrderedMap</a></td>
<td class="colLast">
<div class="block">Red-Black tree-based implementation of Map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ExtendedProperties.html" title="class in org.apache.commons.collections">ExtendedProperties</a></td>
<td class="colLast">
<div class="block">This class extends normal Java properties by adding the possibility
to use the same key many times concatenating the value strings
instead of overwriting them.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/FastArrayList.html" title="class in org.apache.commons.collections">FastArrayList</a></td>
<td class="colLast">
<div class="block">A customized implementation of <code>java.util.ArrayList</code> designed
to operate in a multithreaded environment where the large majority of
method calls are read-only, instead of structural changes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/FastHashMap.html" title="class in org.apache.commons.collections">FastHashMap</a></td>
<td class="colLast">
<div class="block">A customized implementation of <code>java.util.HashMap</code> designed
to operate in a multithreaded environment where the large majority of
method calls are read-only, instead of structural changes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/FastTreeMap.html" title="class in org.apache.commons.collections">FastTreeMap</a></td>
<td class="colLast">
<div class="block">A customized implementation of <code>java.util.TreeMap</code> designed
to operate in a multithreaded environment where the large majority of
method calls are read-only, instead of structural changes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/HashBag.html" title="class in org.apache.commons.collections">HashBag</a></td>
<td class="colLast">
<div class="block">An implementation of <a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a> that is backed by a <code>HashMap</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/IteratorUtils.html" title="class in org.apache.commons.collections">IteratorUtils</a></td>
<td class="colLast">
<div class="block">Provides static utility methods and decorators for <code>Iterator</code>
instances.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ListUtils.html" title="class in org.apache.commons.collections">ListUtils</a></td>
<td class="colLast">
<div class="block">Contains static utility methods and decorators for <code>List</code>
instances.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/LRUMap.html" title="class in org.apache.commons.collections">LRUMap</a></td>
<td class="colLast">
<div class="block">
An implementation of a Map which has a maximum size and uses a Least Recently Used
algorithm to remove items from the Map when the maximum size is reached and new items are added.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/MapUtils.html" title="class in org.apache.commons.collections">MapUtils</a></td>
<td class="colLast">
<div class="block">A helper class for using <code>Map</code> instances.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/MultiHashMap.html" title="class in org.apache.commons.collections">MultiHashMap</a></td>
<td class="colLast">
<div class="block"><code>MultiHashMap</code> is the default implementation of the
<a href="../../../../org/apache/commons/collections/MultiMap.html" title="interface in org.apache.commons.collections"><code>MultiMap</code></a> interface.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ProxyMap.html" title="class in org.apache.commons.collections">ProxyMap</a></td>
<td class="colLast">
<div class="block">This <code>Map</code> wraps another <code>Map</code>
implementation, using the wrapped instance for its default
implementation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/ReferenceMap.html" title="class in org.apache.commons.collections">ReferenceMap</a></td>
<td class="colLast">
<div class="block">Hashtable-based <code>Map</code> implementation that allows
mappings to be removed by the garbage collector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/SequencedHashMap.html" title="class in org.apache.commons.collections">SequencedHashMap</a></td>
<td class="colLast">
<div class="block">A map of objects whose mapping entries are sequenced based on the order in
which they were added.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/SetUtils.html" title="class in org.apache.commons.collections">SetUtils</a></td>
<td class="colLast">
<div class="block">Provides static utility methods and decorators for <code>Set</code>
and <code>SortedSet</code> instances.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/StaticBucketMap.html" title="class in org.apache.commons.collections">StaticBucketMap</a></td>
<td class="colLast">
<div class="block">A StaticBucketMap is an efficient, thread-safe implementation of
<code>java.util.Map</code> that performs well in in a highly
thread-contentious environment.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/SynchronizedPriorityQueue.html" title="class in org.apache.commons.collections">SynchronizedPriorityQueue</a></td>
<td class="colLast">
<div class="block">A thread safe version of the PriorityQueue.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/TreeBag.html" title="class in org.apache.commons.collections">TreeBag</a></td>
<td class="colLast">
<div class="block">An implementation of <a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a> that is backed by a <code>TreeMap</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/UnboundedFifoBuffer.html" title="class in org.apache.commons.collections">UnboundedFifoBuffer</a></td>
<td class="colLast">
<div class="block">UnboundedFifoBuffer is a <strong>very</strong> efficient buffer implementation.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Exception Summary table, listing exceptions, and an explanation">
<caption><span>Exception Summary</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Exception</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BufferOverflowException.html" title="class in org.apache.commons.collections">BufferOverflowException</a></td>
<td class="colLast">
<div class="block">The BufferOverflowException is used when the buffer's capacity has been
exceeded.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../org/apache/commons/collections/BufferUnderflowException.html" title="class in org.apache.commons.collections">BufferUnderflowException</a></td>
<td class="colLast">
<div class="block">The BufferUnderflowException is used when the buffer is already empty</div>
</td>
</tr>
</tbody>
</table>
</li>
</ul>
<a name="package_description">
<!-- -->
</a>
<h2 title="Package org.apache.commons.collections Description">Package org.apache.commons.collections Description</h2>
<div class="block"><p>
Java Collections Framework extensions.
</p>
<p>
See also the <tt>java.util</tt> package.
</p>
<table border="1" cellspacing="0" cellpadding="3">
<tr bgcolor="#CCCCFF" class="TableHeadingColor">
<th>Category</th><th>Classes</th><th>Comments</th>
</tr>
<tr>
<td valign="top">List Implementations</td>
<td>
<a href="../../../../org/apache/commons/collections/CursorableLinkedList.html" title="class in org.apache.commons.collections"><code>CursorableLinkedList</code></a><br>
<a href="../../../../org/apache/commons/collections/FastArrayList.html" title="class in org.apache.commons.collections"><code>FastArrayList</code></a>
</td>
<td valign="top">
Special-purpose implementations of the <code>List</code> interface.
</td>
</tr>
<tr>
<td valign="top">Map Implementations</td>
<td>
<a href="../../../../org/apache/commons/collections/BeanMap.html" title="class in org.apache.commons.collections"><code>BeanMap</code></a><br>
<a href="../../../../org/apache/commons/collections/DoubleOrderedMap.html" title="class in org.apache.commons.collections"><code>DoubleOrderedMap</code></a><br>
<a href="../../../../org/apache/commons/collections/ExtendedProperties.html" title="class in org.apache.commons.collections"><code>ExtendedProperties</code></a><br>
<a href="../../../../org/apache/commons/collections/FastHashMap.html" title="class in org.apache.commons.collections"><code>FastHashMap</code></a><br>
<a href="../../../../org/apache/commons/collections/FastTreeMap.html" title="class in org.apache.commons.collections"><code>FastTreeMap</code></a><br>
<a href="../../../../org/apache/commons/collections/LRUMap.html" title="class in org.apache.commons.collections"><code>LRUMap</code></a><br>
<a href="../../../../org/apache/commons/collections/MultiHashMap.html" title="class in org.apache.commons.collections"><code>MultiHashMap</code></a><br>
<a href="../../../../org/apache/commons/collections/ProxyMap.html" title="class in org.apache.commons.collections"><code>ProxyMap</code></a><br>
<a href="../../../../org/apache/commons/collections/ReferenceMap.html" title="class in org.apache.commons.collections"><code>ReferenceMap</code></a><br>
<a href="../../../../org/apache/commons/collections/SequencedHashMap.html" title="class in org.apache.commons.collections"><code>SequencedHashMap</code></a><br>
<code>SoftRefHashMap</code><br>
<a href="../../../../org/apache/commons/collections/StaticBucketMap.html" title="class in org.apache.commons.collections"><code>StaticBucketMap</code></a><br>
</td>
<td valign="top">
Special-purpose implementations of the <code>Map</code> interface and associated classes.
</td>
</tr>
<tr>
<td valign="top">Buffer Interface and Implementations</td>
<td>
<a href="../../../../org/apache/commons/collections/ArrayStack.html" title="class in org.apache.commons.collections"><code>ArrayStack</code></a><br>
<a href="../../../../org/apache/commons/collections/BinaryHeap.html" title="class in org.apache.commons.collections"><code>BinaryHeap</code></a><br>
<a href="../../../../org/apache/commons/collections/BoundedFifoBuffer.html" title="class in org.apache.commons.collections"><code>BoundedFifoBuffer</code></a><br>
<a href="../../../../org/apache/commons/collections/Buffer.html" title="interface in org.apache.commons.collections"><code>Buffer</code></a><br>
<a href="../../../../org/apache/commons/collections/PriorityQueue.html" title="interface in org.apache.commons.collections"><code>PriorityQueue</code></a><br>
<a href="../../../../org/apache/commons/collections/SynchronizedPriorityQueue.html" title="class in org.apache.commons.collections"><code>SynchronizedPriorityQueue</code></a>
<a href="../../../../org/apache/commons/collections/UnboundedFifoBuffer.html" title="class in org.apache.commons.collections"><code>UnboundedFifoBuffer</code></a>
</td>
<td valign="top">
New collection interface that specifies a removal order for
the collection, used to implement queues and queue-like things.
</td>
</tr>
<td valign="top">Bag Interface and Implementations</td>
<td>
<a href="../../../../org/apache/commons/collections/Bag.html" title="interface in org.apache.commons.collections"><code>Bag</code></a><br>
<a href="../../../../org/apache/commons/collections/DefaultMapBag.html" title="class in org.apache.commons.collections"><code>DefaultMapBag</code></a><br>
<a href="../../../../org/apache/commons/collections/HashBag.html" title="class in org.apache.commons.collections"><code>HashBag</code></a><br>
<a href="../../../../org/apache/commons/collections/SortedBag.html" title="interface in org.apache.commons.collections"><code>SortedBag</code></a><br>
<a href="../../../../org/apache/commons/collections/TreeBag.html" title="class in org.apache.commons.collections"><code>TreeBag</code></a>
</td>
<td valign="top">
New collections interface that keeps a count of its members.
</td>
</tr>
<tr>
<td valign="top">Utilities</td>
<td valign="top">
<a href="../../../../org/apache/commons/collections/BagUtils.html" title="class in org.apache.commons.collections"><code>BagUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/BufferUtils.html" title="class in org.apache.commons.collections"><code>BufferUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/CollectionUtils.html" title="class in org.apache.commons.collections"><code>CollectionUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/ComparatorUtils.html" title="class in org.apache.commons.collections"><code>ComparatorUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/ListUtils.html" title="class in org.apache.commons.collections"><code>ListUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/MapUtils.html" title="class in org.apache.commons.collections"><code>MapUtils</code></a><br>
<a href="../../../../org/apache/commons/collections/SetUtils.html" title="class in org.apache.commons.collections"><code>SetUtils</code></a>
</td>
<td valign="top">
Manipulate collection objects, determine set theoretic
properties, ensure type-safety, provide decorators, etc.
</td>
</tr>
<tr>
<td valign="top">Functor Interfaces</td>
<td valign="top">
<a href="../../../../org/apache/commons/collections/Factory.html" title="interface in org.apache.commons.collections"><code>Factory</code></a><br>
<a href="../../../../org/apache/commons/collections/Predicate.html" title="interface in org.apache.commons.collections"><code>Predicate</code></a><br>
<a href="../../../../org/apache/commons/collections/Closure.html" title="interface in org.apache.commons.collections"><code>Closure</code></a><br>
<a href="../../../../org/apache/commons/collections/Transformer.html" title="interface in org.apache.commons.collections"><code>Transformer</code></a><br>
</td>
<td valign="top">
Create views or functors on a collection. If your collection
represents <i>X</i>, these allow you to define and look at
<i>f(X)</i>.
</td>
</tr>
<tr>
<td valign="top">Miscellaneous</td>
<td valign="top">
<code>StringStack</code><br>
<a href="../../../../org/apache/commons/collections/DefaultMapEntry.html" title="class in org.apache.commons.collections"><code>DefaultMapEntry</code></a><br>
</td>
<td valign="top">
A stack of strings; and the trivial implementation of
<code>Map.Entry</code>.
</td>
</tr>
</table></div>
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