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<div class="subTitle">org.apache.axis.collections</div>
<h2 title="Class LRUMap" class="title">Class LRUMap</h2>
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<ul class="inheritance">
<li>org.apache.axis.collections.LRUMap</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Cloneable.html?is-external=true" title="class or interface in java.lang">Cloneable</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a></dd>
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<pre>public class <span class="strong">LRUMap</span>
extends <a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a>
implements <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a></pre>
<div class="block"><p>
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.
</p>
<p>
A synchronized version can be obtained with:
<code>Collections.synchronizedMap( theMapToSynchronize )</code>
If it will be accessed by multiple threads, you _must_ synchronize access
to this Map. Even concurrent get(Object) operations produce indeterminate
behaviour.
</p>
<p>
Unlike the Collections 1.0 version, this version of LRUMap does use a true
LRU algorithm. The keys for all gets and puts are moved to the front of
the list. LRUMap is now a subclass of SequencedHashMap, and the "LRU"
key is now equivalent to LRUMap.getFirst().
</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>Commons Collections 1.0</dd>
<dt><span class="strong">Author:</span></dt>
<dd><a href="mailto:jstrachan@apache.org">James Strachan</a>, <a href="mailto:morgand@apache.org">Morgan Delagrange</a></dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.axis.collections.LRUMap">Serialized Form</a></dd></dl>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#LRUMap()">LRUMap</a></strong>()</code>
<div class="block">Default constructor, primarily for the purpose of
de-externalization.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#LRUMap(int)">LRUMap</a></strong>(int&nbsp;i)</code>
<div class="block">Create a new LRUMap with a maximum capacity of <i>i</i>.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#get(java.lang.Object)">get</a></strong>(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key)</code>
<div class="block">Get the value for a key from the Map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#getMaximumSize()">getMaximumSize</a></strong>()</code>
<div class="block">Getter for property maximumSize.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#processRemovedLRU(java.lang.Object,%20java.lang.Object)">processRemovedLRU</a></strong>(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key,
<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</code>
<div class="block">Subclasses of LRUMap may hook into this method to
provide specialized actions whenever an Object is
automatically removed from the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#put(java.lang.Object,%20java.lang.Object)">put</a></strong>(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key,
<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</code>
<div class="block">Removes the key and its Object from the Map.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#readExternal(java.io.ObjectInput)">readExternal</a></strong>(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/ObjectInput.html?is-external=true" title="class or interface in java.io">ObjectInput</a>&nbsp;in)</code>
<div class="block">Deserializes this map from the given stream.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#removeLRU()">removeLRU</a></strong>()</code>
<div class="block">This method is used internally by the class for
finding and removing the LRU Object.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#setMaximumSize(int)">setMaximumSize</a></strong>(int&nbsp;maximumSize)</code>
<div class="block">Setter for property maximumSize.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis/collections/LRUMap.html#writeExternal(java.io.ObjectOutput)">writeExternal</a></strong>(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/ObjectOutput.html?is-external=true" title="class or interface in java.io">ObjectOutput</a>&nbsp;out)</code>
<div class="block">Serializes this map to the given stream.</div>
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<h3>Methods inherited from class&nbsp;org.apache.axis.collections.<a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a></h3>
<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#clear()">clear</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#clone()">clone</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#containsKey(java.lang.Object)">containsKey</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#containsValue(java.lang.Object)">containsValue</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#entrySet()">entrySet</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#equals(java.lang.Object)">equals</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#get(int)">get</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getFirst()">getFirst</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getFirstKey()">getFirstKey</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getFirstValue()">getFirstValue</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getLast()">getLast</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getLastKey()">getLastKey</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getLastValue()">getLastValue</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#getValue(int)">getValue</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#hashCode()">hashCode</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#indexOf(java.lang.Object)">indexOf</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#isEmpty()">isEmpty</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#iterator()">iterator</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#keySet()">keySet</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#lastIndexOf(java.lang.Object)">lastIndexOf</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#putAll(java.util.Map)">putAll</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#remove(int)">remove</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#remove(java.lang.Object)">remove</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#sequence()">sequence</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#size()">size</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#toString()">toString</a>, <a href="../../../../org/apache/axis/collections/SequencedHashMap.html#values()">values</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
<a name="LRUMap()">
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<h4>LRUMap</h4>
<pre>public&nbsp;LRUMap()</pre>
<div class="block">Default constructor, primarily for the purpose of
de-externalization. This constructors sets a default
LRU limit of 100 keys, but this value may be overridden
internally as a result of de-externalization.</div>
</li>
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<a name="LRUMap(int)">
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<h4>LRUMap</h4>
<pre>public&nbsp;LRUMap(int&nbsp;i)</pre>
<div class="block">Create a new LRUMap with a maximum capacity of <i>i</i>.
Once <i>i</i> capacity is achieved, subsequent gets
and puts will push keys out of the map. See .</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>i</code> - Maximum capacity of the LRUMap</dd></dl>
</li>
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</li>
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<h3>Method Detail</h3>
<a name="get(java.lang.Object)">
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<h4>get</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;get(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key)</pre>
<div class="block"><p>Get the value for a key from the Map. The key
will be promoted to the Most Recently Used position.
Note that get(Object) operations will modify
the underlying Collection. Calling get(Object)
inside of an iteration over keys, values, etc. is
currently unsupported.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html?is-external=true#get(java.lang.Object)" title="class or interface in java.util">get</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#get(java.lang.Object)">get</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key to retrieve</dd>
<dt><span class="strong">Returns:</span></dt><dd>Returns the value. Returns null if the key has a
null value <i>or</i> if the key has no value.</dd></dl>
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<a name="put(java.lang.Object, java.lang.Object)">
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<h4>put</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;put(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key,
<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</pre>
<div class="block"><p>Removes the key and its Object from the Map.</p>
<p>(Note: this may result in the "Least Recently Used"
object being removed from the Map. In that case,
the removeLRU() method is called. See javadoc for
removeLRU() for more details.)</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html?is-external=true#put(java.lang.Object,%20java.lang.Object)" title="class or interface in java.util">put</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#put(java.lang.Object,%20java.lang.Object)">put</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key of the Object to add.</dd><dd><code>value</code> - Object to add</dd>
<dt><span class="strong">Returns:</span></dt><dd>Former value of the key</dd></dl>
</li>
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<a name="removeLRU()">
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<h4>removeLRU</h4>
<pre>protected&nbsp;void&nbsp;removeLRU()</pre>
<div class="block">This method is used internally by the class for
finding and removing the LRU Object.</div>
</li>
</ul>
<a name="processRemovedLRU(java.lang.Object, java.lang.Object)">
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<h4>processRemovedLRU</h4>
<pre>protected&nbsp;void&nbsp;processRemovedLRU(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key,
<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;value)</pre>
<div class="block">Subclasses of LRUMap may hook into this method to
provide specialized actions whenever an Object is
automatically removed from the cache. By default,
this method does nothing.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - key that was removed</dd><dd><code>value</code> - value of that key (can be null)</dd></dl>
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<h4>readExternal</h4>
<pre>public&nbsp;void&nbsp;readExternal(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/ObjectInput.html?is-external=true" title="class or interface in java.io">ObjectInput</a>&nbsp;in)
throws <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#readExternal(java.io.ObjectInput)">SequencedHashMap</a></code></strong></div>
<div class="block">Deserializes this map from the given stream.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true#readExternal(java.io.ObjectInput)" title="class or interface in java.io">readExternal</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#readExternal(java.io.ObjectInput)">readExternal</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - the stream to deserialize from</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if the stream raises it</dd>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></code> - if the stream raises it</dd></dl>
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<h4>writeExternal</h4>
<pre>public&nbsp;void&nbsp;writeExternal(<a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/ObjectOutput.html?is-external=true" title="class or interface in java.io">ObjectOutput</a>&nbsp;out)
throws <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#writeExternal(java.io.ObjectOutput)">SequencedHashMap</a></code></strong></div>
<div class="block">Serializes this map to the given stream.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true#writeExternal(java.io.ObjectOutput)" title="class or interface in java.io">writeExternal</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html#writeExternal(java.io.ObjectOutput)">writeExternal</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/axis/collections/SequencedHashMap.html" title="class in org.apache.axis.collections">SequencedHashMap</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>out</code> - the stream to serialize to</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if the stream raises it</dd></dl>
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<h4>getMaximumSize</h4>
<pre>public&nbsp;int&nbsp;getMaximumSize()</pre>
<div class="block">Getter for property maximumSize.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Value of property maximumSize.</dd></dl>
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<h4>setMaximumSize</h4>
<pre>public&nbsp;void&nbsp;setMaximumSize(int&nbsp;maximumSize)</pre>
<div class="block">Setter for property maximumSize.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>maximumSize</code> - New value of property maximumSize.</dd></dl>
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