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<title>StoredKeySet (Oracle - Berkeley DB Java Edition API)</title>
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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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<div class="subTitle">com.sleepycat.collections</div>
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<h2 title="Class StoredKeySet" class="title">Class StoredKeySet<K></h2>
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>
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<ul class="inheritance">
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<li><a href="../../../com/sleepycat/collections/StoredContainer.html" title="class in com.sleepycat.collections">com.sleepycat.collections.StoredContainer</a></li>
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<li>
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<ul class="inheritance">
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<li><a href="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">com.sleepycat.collections.StoredCollection</a><K></li>
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<li>
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<ul class="inheritance">
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<li>com.sleepycat.collections.StoredKeySet<K></li>
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</ul>
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<dt>All Implemented Interfaces:</dt>
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<dd>java.lang.Cloneable, java.lang.Iterable<K>, java.util.Collection<K>, java.util.Set<K></dd>
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<dl>
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<dt>Direct Known Subclasses:</dt>
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<dd><a href="../../../com/sleepycat/collections/StoredSortedKeySet.html" title="class in com.sleepycat.collections">StoredSortedKeySet</a></dd>
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<br>
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<pre>public class <span class="typeNameLabel">StoredKeySet<K></span>
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extends <a href="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</a><K>
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implements java.util.Set<K></pre>
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<div class="block">The Set returned by Map.keySet() and which can also be constructed directly
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if a Map is not needed.
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Since this collection is a set it only contains one element for each key,
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even when duplicates are allowed. Key set iterators are therefore
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particularly useful for enumerating the unique keys of a store or index that
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allows duplicates.</div>
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<dl>
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<dt><span class="simpleTagLabel">Author:</span></dt>
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<dd>Mark Hayes</dd>
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</dl>
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<h3>Fields inherited from class com.sleepycat.collections.<a href="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</a></h3>
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<code><a href="../../../com/sleepycat/collections/StoredCollection.html#DEFAULT_ITERATOR_BLOCK_SIZE">DEFAULT_ITERATOR_BLOCK_SIZE</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../com/sleepycat/collections/StoredKeySet.html#StoredKeySet-com.sleepycat.je.Database-com.sleepycat.bind.EntryBinding-boolean-">StoredKeySet</a></span>(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a> database,
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<a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>> keyBinding,
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boolean writeAllowed)</code>
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<div class="block">Creates a key set view of a <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a>.</div>
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</td>
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<h3>Method Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/collections/StoredKeySet.html#add-K-">add</a></span>(<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a> key)</code>
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<div class="block">Adds the specified key to this set if it is not already present
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(optional operation).</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/collections/StoredKeySet.html#contains-java.lang.Object-">contains</a></span>(java.lang.Object key)</code>
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<div class="block">Returns true if this set contains the specified key.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/collections/StoredKeySet.html#remove-java.lang.Object-">remove</a></span>(java.lang.Object key)</code>
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<div class="block">Removes the specified key from this set if it is present (optional
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operation).</div>
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</td>
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</tr>
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<h3>Methods inherited from class com.sleepycat.collections.<a href="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</a></h3>
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<code><a href="../../../com/sleepycat/collections/StoredCollection.html#addAll-java.util.Collection-">addAll</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#containsAll-java.util.Collection-">containsAll</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#equals-java.lang.Object-">equals</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#getIteratorBlockSize--">getIteratorBlockSize</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#hashCode--">hashCode</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#iterator--">iterator</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#iterator-boolean-">iterator</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#join-com.sleepycat.collections.StoredContainer:A-java.lang.Object:A-com.sleepycat.je.JoinConfig-">join</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#removeAll-java.util.Collection-">removeAll</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#retainAll-java.util.Collection-">retainAll</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#setIteratorBlockSize-int-">setIteratorBlockSize</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#size--">size</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#storedIterator--">storedIterator</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#storedIterator-boolean-">storedIterator</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#toArray--">toArray</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#toArray-T:A-">toArray</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#toList--">toList</a>, <a href="../../../com/sleepycat/collections/StoredCollection.html#toString--">toString</a></code></li>
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<h3>Methods inherited from class com.sleepycat.collections.<a href="../../../com/sleepycat/collections/StoredContainer.html" title="class in com.sleepycat.collections">StoredContainer</a></h3>
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<code><a href="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesAllowed--">areDuplicatesAllowed</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesOrdered--">areDuplicatesOrdered</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#areKeyRangesAllowed--">areKeyRangesAllowed</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#areKeysRenumbered--">areKeysRenumbered</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#clear--">clear</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#getCursorConfig--">getCursorConfig</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#isEmpty--">isEmpty</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#isOrdered--">isOrdered</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#isSecondary--">isSecondary</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#isTransactional--">isTransactional</a>, <a href="../../../com/sleepycat/collections/StoredContainer.html#isWriteAllowed--">isWriteAllowed</a></code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Methods inherited from interface java.util.Set</h3>
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<code>addAll, clear, containsAll, equals, hashCode, isEmpty, iterator, removeAll, retainAll, size, spliterator, toArray, toArray</code></li>
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<h3>Methods inherited from interface java.util.Collection</h3>
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<code>parallelStream, removeIf, stream</code></li>
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<h3>Methods inherited from interface java.lang.Iterable</h3>
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<code>forEach</code></li>
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</li>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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</a>
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<h3>Constructor Detail</h3>
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<a name="StoredKeySet-com.sleepycat.je.Database-com.sleepycat.bind.EntryBinding-boolean-">
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<h4>StoredKeySet</h4>
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<pre>public StoredKeySet(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a> database,
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<a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>> keyBinding,
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boolean writeAllowed)</pre>
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<div class="block">Creates a key set view of a <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a>.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>database</code> - is the Database underlying the new collection.</dd>
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<dd><code>keyBinding</code> - is the binding used to translate between key buffers
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and key objects.</dd>
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<dd><code>writeAllowed</code> - is true to create a read-write collection or false
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to create a read-only collection.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.IllegalArgumentException</code> - if formats are not consistently
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defined or a parameter is invalid.</dd>
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<dd><code><a href="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</a></code> - if a checked exception is thrown,
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including a <code>DatabaseException</code> on BDB (C Edition).</dd>
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</dl>
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</li>
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<h3>Method Detail</h3>
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<a name="add-java.lang.Object-">
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</a><a name="add-K-">
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<h4>add</h4>
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<pre>public boolean add(<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a> key)</pre>
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<div class="block">Adds the specified key to this set if it is not already present
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(optional operation).
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This method conforms to the <code>Set.add(E)</code> interface.
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<p>WARNING: When a key is added the value in the underlying data store
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will be empty, i.e., the byte array will be zero length. Such a record
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cannot be accessed using the Map interface unless the value binding
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supports zero length byte arrays.</p>
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<!-- begin JE only --></div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code>add</code> in interface <code>java.util.Collection<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code>add</code> in interface <code>java.util.Set<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
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href="../je/OperationFailureException.html#writeFailures">Write
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Operation Failures</a> occurs.</dd>
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<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
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environment-wide failure occurs.
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<!-- end JE only --></dd>
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<dd><code>java.lang.UnsupportedOperationException</code> - if the collection is indexed, or
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if the collection is read-only.</dd>
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<dd><code><a href="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</a></code> - if a checked exception is thrown,
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including a <code>DatabaseException</code> on BDB (C Edition).</dd>
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</dl>
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</li>
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</ul>
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<a name="remove-java.lang.Object-">
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<!-- -->
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<h4>remove</h4>
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<pre>public boolean remove(java.lang.Object key)</pre>
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<div class="block">Removes the specified key from this set if it is present (optional
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operation).
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If duplicates are allowed, this method removes all duplicates for the
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|
given key.
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This method conforms to the <code>Set.remove(java.lang.Object)</code> interface.
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<!-- begin JE only --></div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code>remove</code> in interface <code>java.util.Collection<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
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|
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
|
|
<dd><code>remove</code> in interface <code>java.util.Set<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
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|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
|
href="../je/OperationFailureException.html#writeFailures">Write
|
|
Operation Failures</a> occurs.</dd>
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
|
environment-wide failure occurs.
|
|
<!-- end JE only --></dd>
|
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<dd><code>java.lang.UnsupportedOperationException</code> - if the collection is read-only.</dd>
|
|
<dd><code><a href="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</a></code> - if a checked exception is thrown,
|
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including a <code>DatabaseException</code> on BDB (C Edition).</dd>
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</dl>
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<!-- -->
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<h4>contains</h4>
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<pre>public boolean contains(java.lang.Object key)</pre>
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<div class="block">Returns true if this set contains the specified key.
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This method conforms to the <code>Set.contains(java.lang.Object)</code> interface.
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<!-- begin JE only --></div>
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<dl>
|
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
|
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<dd><code>contains</code> in interface <code>java.util.Collection<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
|
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
|
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<dd><code>contains</code> in interface <code>java.util.Set<<a href="../../../com/sleepycat/collections/StoredKeySet.html" title="type parameter in StoredKeySet">K</a>></code></dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
|
Failures</a> occurs.</dd>
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
|
environment-wide failure occurs.
|
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<!-- end JE only --></dd>
|
|
<dd><code><a href="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</a></code> - if a checked exception is thrown,
|
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including a <code>DatabaseException</code> on BDB (C Edition).</dd>
|
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</dl>
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