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ConcurrentLinkedQueue (OpenJPA 1.0.1 API) | |
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org.apache.openjpa.lib.util.concurrent</FONT> | |
<BR> | |
Class ConcurrentLinkedQueue</H2> | |
<PRE> | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> | |
<IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">java.util.AbstractCollection</A> | |
<IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.openjpa.lib.util.concurrent.ConcurrentLinkedQueue</B> | |
</PRE> | |
<DL> | |
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Iterable.html" title="class or interface in java.lang">Iterable</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>, <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></DD> | |
</DL> | |
<HR> | |
<DL> | |
<DT><PRE>public class <B>ConcurrentLinkedQueue</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A><DT>implements <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DL> | |
</PRE> | |
<P> | |
An unbounded thread-safe <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">queue</A> based on linked nodes. | |
This queue orders elements FIFO(first-in-first-out). | |
The <em>head</em> of the queue is that element that has been on the | |
queue the longest time. | |
The <em>tail</em> of the queue is that element that has been on the | |
queue the shortest time. New elements | |
are inserted at the tail of the queue, and the queue retrieval | |
operations obtain elements at the head of the queue. | |
A <tt>ConcurrentLinkedQueue</tt> is an appropriate choice when | |
many threads will share access to a common collection. | |
This queue does not permit <tt>null</tt> elements. | |
This implementation employs an efficient "wait-free" | |
algorithm based on one described in <a | |
href="http://www.cs.rochester.edu/u/michael/PODC96.html"> Simple, | |
Fast, and Practical Non-Blocking and Blocking Concurrent Queue | |
Algorithms</a> by Maged M. Michael and Michael L. Scott. | |
Beware that, unlike in most collections, the <tt>size</tt> method | |
is <em>NOT</em> a constant-time operation. Because of the | |
asynchronous nature of these queues, determining the current number | |
of elements requires a traversal of the elements. | |
This class and its iterator implement all of the | |
<em>optional</em> methods of the <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> and <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Iterator.html" title="class or interface in java.util"><CODE>Iterator</CODE></A> interfaces. Memory consistency effects: As with other concurrent | |
collections, actions in a thread prior to placing an object into a | |
<code>ConcurrentLinkedQueue</code> | |
<a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a> | |
actions subsequent to the access or removal of that element from | |
the <code>ConcurrentLinkedQueue</code> in another thread. | |
This class is a member of the | |
<a href="../../../../../../../guide/collections/index.html"> | |
Java Collections Framework</a>. | |
<P> | |
<P> | |
<DL> | |
<DT><B>Since:</B></DT> | |
<DD>1.5</DD> | |
<DT><B>Author:</B></DT> | |
<DD>Doug Lea</DD> | |
<DT><B>See Also:</B><DD><A HREF="../../../../../../serialized-form.html#org.apache.openjpa.lib.util.concurrent.ConcurrentLinkedQueue">Serialized Form</A></DL> | |
<HR> | |
<P> | |
<!-- ======== CONSTRUCTOR SUMMARY ======== --> | |
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<B>Constructor Summary</B></FONT></TH> | |
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<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#ConcurrentLinkedQueue()">ConcurrentLinkedQueue</A></B>()</CODE> | |
<BR> | |
</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#ConcurrentLinkedQueue(java.util.Collection)">ConcurrentLinkedQueue</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> c)</CODE> | |
<BR> | |
Creates a <tt>ConcurrentLinkedQueue</tt> | |
initially containing the elements of the given collection, | |
added in traversal order of the collection's iterator.</TD> | |
</TR> | |
</TABLE> | |
| |
<!-- ========== METHOD SUMMARY =========== --> | |
<A NAME="method_summary"><!-- --></A> | |
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> | |
<B>Method Summary</B></FONT></TH> | |
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#add(java.lang.Object)">add</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> e)</CODE> | |
<BR> | |
Inserts the specified element at the tail of this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#addAll(java.util.Collection)">addAll</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> c)</CODE> | |
<BR> | |
Adds all of the elements in the specified collection to this | |
queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> void</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#clear()">clear</A></B>()</CODE> | |
<BR> | |
Removes all of the elements from this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#contains(java.lang.Object)">contains</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> o)</CODE> | |
<BR> | |
Returns <tt>true</tt> if this queue contains the specified element.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#element()">element</A></B>()</CODE> | |
<BR> | |
Retrieves, but does not remove, the head of this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#isEmpty()">isEmpty</A></B>()</CODE> | |
<BR> | |
Returns <tt>true</tt> if this queue contains no elements.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#iterator()">iterator</A></B>()</CODE> | |
<BR> | |
Returns an iterator over the elements in this queue in proper sequence.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#offer(java.lang.Object)">offer</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> e)</CODE> | |
<BR> | |
Inserts the specified element at the tail of this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#peek()">peek</A></B>()</CODE> | |
<BR> | |
Retrieves, but does not remove, the head of this queue, | |
or returns <tt>null</tt> if this queue is empty.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#poll()">poll</A></B>()</CODE> | |
<BR> | |
Retrieves and removes the head of this queue, | |
or returns <tt>null</tt> if this queue is empty.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#remove()">remove</A></B>()</CODE> | |
<BR> | |
Retrieves and removes the head of this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> boolean</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#remove(java.lang.Object)">remove</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> o)</CODE> | |
<BR> | |
Removes a single instance of the specified element from this queue, | |
if it is present.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> int</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#size()">size</A></B>()</CODE> | |
<BR> | |
Returns the number of elements in this queue.</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[]</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#toArray()">toArray</A></B>()</CODE> | |
<BR> | |
</TD> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[]</CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#toArray(java.lang.Object[])">toArray</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] a)</CODE> | |
<BR> | |
</TD> | |
</TR> | |
</TABLE> | |
<A NAME="methods_inherited_from_class_java.util.AbstractCollection"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> | |
<TH ALIGN="left"><B>Methods inherited from class java.util.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></B></TH> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#containsAll(java.util.Collection)" title="class or interface in java.util">containsAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#removeAll(java.util.Collection)" title="class or interface in java.util">removeAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#retainAll(java.util.Collection)" title="class or interface in java.util">retainAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#toString()" title="class or interface in java.util">toString</A></CODE></TD> | |
</TR> | |
</TABLE> | |
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> | |
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> | |
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</TABLE> | |
<A NAME="methods_inherited_from_class_org.apache.openjpa.lib.util.concurrent.Queue"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> | |
<TH ALIGN="left"><B>Methods inherited from interface org.apache.openjpa.lib.util.concurrent.<A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></B></TH> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#element()">element</A>, <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#remove()">remove</A></CODE></TD> | |
</TR> | |
</TABLE> | |
<A NAME="methods_inherited_from_class_java.util.Collection"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> | |
<TH ALIGN="left"><B>Methods inherited from interface java.util.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></B></TH> | |
</TR> | |
<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#addAll(java.util.Collection)" title="class or interface in java.util">addAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#clear()" title="class or interface in java.util">clear</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#containsAll(java.util.Collection)" title="class or interface in java.util">containsAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#equals(java.lang.Object)" title="class or interface in java.util">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#hashCode()" title="class or interface in java.util">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#removeAll(java.util.Collection)" title="class or interface in java.util">removeAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#retainAll(java.util.Collection)" title="class or interface in java.util">retainAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#toArray()" title="class or interface in java.util">toArray</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#toArray(T[])" title="class or interface in java.util">toArray</A></CODE></TD> | |
</TR> | |
</TABLE> | |
| |
<P> | |
<!-- ========= CONSTRUCTOR DETAIL ======== --> | |
<A NAME="constructor_detail"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> | |
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> | |
<B>Constructor Detail</B></FONT></TH> | |
</TR> | |
</TABLE> | |
<A NAME="ConcurrentLinkedQueue()"><!-- --></A><H3> | |
ConcurrentLinkedQueue</H3> | |
<PRE> | |
public <B>ConcurrentLinkedQueue</B>()</PRE> | |
<DL> | |
</DL> | |
<HR> | |
<A NAME="ConcurrentLinkedQueue(java.util.Collection)"><!-- --></A><H3> | |
ConcurrentLinkedQueue</H3> | |
<PRE> | |
public <B>ConcurrentLinkedQueue</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> c)</PRE> | |
<DL> | |
<DD>Creates a <tt>ConcurrentLinkedQueue</tt> | |
initially containing the elements of the given collection, | |
added in traversal order of the collection's iterator. | |
<P> | |
<DL> | |
<DT><B>Parameters:</B><DD><CODE>c</CODE> - the collection of elements to initially contain | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if the specified collection or any | |
of its elements are null</DL> | |
</DL> | |
<!-- ============ METHOD DETAIL ========== --> | |
<A NAME="method_detail"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> | |
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> | |
<B>Method Detail</B></FONT></TH> | |
</TR> | |
</TABLE> | |
<A NAME="add(java.lang.Object)"><!-- --></A><H3> | |
add</H3> | |
<PRE> | |
public boolean <B>add</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> e)</PRE> | |
<DL> | |
<DD>Inserts the specified element at the tail of this queue. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add(E)" title="class or interface in java.util">add</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#add(java.lang.Object)">add</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>e</CODE> - the element to add | |
<DT><B>Returns:</B><DD><tt>true</tt> (as specified by <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add(E)" title="class or interface in java.util"><CODE>Collection.add(E)</CODE></A>) | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if the specified element is null</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="offer(java.lang.Object)"><!-- --></A><H3> | |
offer</H3> | |
<PRE> | |
public boolean <B>offer</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> e)</PRE> | |
<DL> | |
<DD>Inserts the specified element at the tail of this queue. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#offer(java.lang.Object)">offer</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>e</CODE> - the element to add | |
<DT><B>Returns:</B><DD><tt>true</tt> (as specified by <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#offer(java.lang.Object)"><CODE>Queue.offer(java.lang.Object)</CODE></A>) | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if the specified element is null</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="poll()"><!-- --></A><H3> | |
poll</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>poll</B>()</PRE> | |
<DL> | |
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#poll()">Queue</A></CODE></B></DD> | |
<DD>Retrieves and removes the head of this queue, | |
or returns <tt>null</tt> if this queue is empty. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#poll()">poll</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>the head of this queue, or <tt>null</tt> if this queue is empty</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="peek()"><!-- --></A><H3> | |
peek</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>peek</B>()</PRE> | |
<DL> | |
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#peek()">Queue</A></CODE></B></DD> | |
<DD>Retrieves, but does not remove, the head of this queue, | |
or returns <tt>null</tt> if this queue is empty. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#peek()">peek</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>the head of this queue, or <tt>null</tt> if this queue is empty</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="isEmpty()"><!-- --></A><H3> | |
isEmpty</H3> | |
<PRE> | |
public boolean <B>isEmpty</B>()</PRE> | |
<DL> | |
<DD>Returns <tt>true</tt> if this queue contains no elements. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#isEmpty()" title="class or interface in java.util">isEmpty</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#isEmpty()" title="class or interface in java.util">isEmpty</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD><tt>true</tt> if this queue contains no elements</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="size()"><!-- --></A><H3> | |
size</H3> | |
<PRE> | |
public int <B>size</B>()</PRE> | |
<DL> | |
<DD>Returns the number of elements in this queue. If this queue | |
contains more than <tt>Integer.MAX_VALUE</tt> elements, returns | |
<tt>Integer.MAX_VALUE</tt>. | |
Beware that, unlike in most collections, this method is | |
<em>NOT</em> a constant-time operation. Because of the | |
asynchronous nature of these queues, determining the current | |
number of elements requires an O(n) traversal. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#size()" title="class or interface in java.util">size</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#size()" title="class or interface in java.util">size</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>the number of elements in this queue</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="contains(java.lang.Object)"><!-- --></A><H3> | |
contains</H3> | |
<PRE> | |
public boolean <B>contains</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> o)</PRE> | |
<DL> | |
<DD>Returns <tt>true</tt> if this queue contains the specified element. | |
More formally, returns <tt>true</tt> if and only if this queue contains | |
at least one element <tt>e</tt> such that <tt>o.equals(e)</tt>. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#contains(java.lang.Object)" title="class or interface in java.util">contains</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#contains(java.lang.Object)" title="class or interface in java.util">contains</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>o</CODE> - object to be checked for containment in this queue | |
<DT><B>Returns:</B><DD><tt>true</tt> if this queue contains the specified element</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="remove(java.lang.Object)"><!-- --></A><H3> | |
remove</H3> | |
<PRE> | |
public boolean <B>remove</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> o)</PRE> | |
<DL> | |
<DD>Removes a single instance of the specified element from this queue, | |
if it is present. More formally, removes an element <tt>e</tt> such | |
that <tt>o.equals(e)</tt>, if this queue contains one or more such | |
elements. | |
Returns <tt>true</tt> if this queue contained the specified element | |
(or equivalently, if this queue changed as a result of the call). | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#remove(java.lang.Object)" title="class or interface in java.util">remove</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#remove(java.lang.Object)" title="class or interface in java.util">remove</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>o</CODE> - element to be removed from this queue, if present | |
<DT><B>Returns:</B><DD><tt>true</tt> if this queue changed as a result of the call</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="iterator()"><!-- --></A><H3> | |
iterator</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A> <B>iterator</B>()</PRE> | |
<DL> | |
<DD>Returns an iterator over the elements in this queue in proper sequence. | |
The returned iterator is a "weakly consistent" iterator that | |
will never throw <CODE>ConcurrentModificationException</CODE>, | |
and guarantees to traverse elements as they existed upon | |
construction of the iterator, and may(but is not guaranteed to) | |
reflect any modifications subsequent to construction. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Iterable.html#iterator()" title="class or interface in java.lang">iterator</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Iterable.html" title="class or interface in java.lang">Iterable</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#iterator()" title="class or interface in java.util">iterator</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#iterator()" title="class or interface in java.util">iterator</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>an iterator over the elements in this queue in proper sequence</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="remove()"><!-- --></A><H3> | |
remove</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>remove</B>()</PRE> | |
<DL> | |
<DD>Retrieves and removes the head of this queue. This method differs | |
from <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#poll()"><CODE>poll</CODE></A> only in that it throws an exception if this | |
queue is empty. This implementation returns the result of <tt>poll</tt> | |
unless the queue is empty. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#remove()">remove</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>the head of this queue | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/NoSuchElementException.html" title="class or interface in java.util">NoSuchElementException</A></CODE> - if this queue is empty</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="element()"><!-- --></A><H3> | |
element</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>element</B>()</PRE> | |
<DL> | |
<DD>Retrieves, but does not remove, the head of this queue. This method | |
differs from <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#peek()"><CODE>peek</CODE></A> only in that it throws an exception if | |
this queue is empty. | |
This implementation returns the result of <tt>peek</tt> | |
unless the queue is empty. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#element()">element</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html" title="interface in org.apache.openjpa.lib.util.concurrent">Queue</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Returns:</B><DD>the head of this queue | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/NoSuchElementException.html" title="class or interface in java.util">NoSuchElementException</A></CODE> - if this queue is empty</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="clear()"><!-- --></A><H3> | |
clear</H3> | |
<PRE> | |
public void <B>clear</B>()</PRE> | |
<DL> | |
<DD>Removes all of the elements from this queue. | |
The queue will be empty after this call returns. | |
This implementation repeatedly invokes <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Queue.html#poll()"><CODE>poll</CODE></A> until it | |
returns <tt>null</tt>. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#clear()" title="class or interface in java.util">clear</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#clear()" title="class or interface in java.util">clear</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="addAll(java.util.Collection)"><!-- --></A><H3> | |
addAll</H3> | |
<PRE> | |
public boolean <B>addAll</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> c)</PRE> | |
<DL> | |
<DD>Adds all of the elements in the specified collection to this | |
queue. Attempts to addAll of a queue to itself result in | |
<tt>IllegalArgumentException</tt>. Further, the behavior of | |
this operation is undefined if the specified collection is | |
modified while the operation is in progress. | |
This implementation iterates over the specified collection, | |
and adds each element returned by the iterator to this | |
queue, in turn. A runtime exception encountered while | |
trying to add an element(including, in particular, a | |
<tt>null</tt> element) may result in only some of the elements | |
having been successfully added when the associated exception is thrown. | |
<P> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#addAll(java.util.Collection)" title="class or interface in java.util">addAll</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#addAll(java.util.Collection)" title="class or interface in java.util">addAll</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>c</CODE> - collection containing elements to be added to this queue | |
<DT><B>Returns:</B><DD><tt>true</tt> if this queue changed as a result of the call | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassCastException.html" title="class or interface in java.lang">ClassCastException</A></CODE> - if the class of an element of the specified | |
collection prevents it from being added to this queue | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if the specified collection contains a | |
null element and this queue does not permit null elements, | |
or if the specified collection is null | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if some property of an element of the | |
specified collection prevents it from being added to this | |
queue, or if the specified collection is this queue | |
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if not all the elements can be added at | |
this time due to insertion restrictions<DT><B>See Also:</B><DD><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/ConcurrentLinkedQueue.html#add(java.lang.Object)"><CODE>add(Object)</CODE></A></DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="toArray()"><!-- --></A><H3> | |
toArray</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] <B>toArray</B>()</PRE> | |
<DL> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#toArray()" title="class or interface in java.util">toArray</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#toArray()" title="class or interface in java.util">toArray</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
</DD> | |
<DD><DL> | |
</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="toArray(java.lang.Object[])"><!-- --></A><H3> | |
toArray</H3> | |
<PRE> | |
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] <B>toArray</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] a)</PRE> | |
<DL> | |
<DD><DL> | |
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#toArray(T[])" title="class or interface in java.util">toArray</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html#toArray(T[])" title="class or interface in java.util">toArray</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/AbstractCollection.html" title="class or interface in java.util">AbstractCollection</A></CODE></DL> | |
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