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ForwardingQueue (Google Collections Library 1.0-rc5)
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com.google.common.collect</FONT>
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Class ForwardingQueue&lt;E&gt;</H2>
<PRE>
<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/google/common/collect/ForwardingObject.html" title="class in com.google.common.collect">com.google.common.collect.ForwardingObject</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/google/common/collect/ForwardingCollection.html" title="class in com.google.common.collect">com.google.common.collect.ForwardingCollection</A>&lt;E&gt;
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.collect.ForwardingQueue&lt;E&gt;</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;E&gt;, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&lt;E&gt;, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;E&gt;</DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <B>ForwardingQueue&lt;E&gt;</B><DT>extends <A HREF="../../../../com/google/common/collect/ForwardingCollection.html" title="class in com.google.common.collect">ForwardingCollection</A>&lt;E&gt;<DT>implements <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;E&gt;</DL>
</PRE>
<P>
A queue which forwards all its method calls to another queue. Subclasses
should override one or more methods to modify the behavior of the backing
queue as desired per the <a
href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Mike Bostock</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../com/google/common/collect/ForwardingObject.html" title="class in com.google.common.collect"><CODE>ForwardingObject</CODE></A></DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#ForwardingQueue()">ForwardingQueue</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#delegate()">delegate</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the backing delegate instance that methods are forwarded to.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#element()">element</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#offer(E)">offer</A></B>(<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&nbsp;o)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inserts the specified element into this queue if it is possible to do
so immediately without violating capacity restrictions.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#peek()">peek</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>&nbsp;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#poll()">poll</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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>&nbsp;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ForwardingQueue.html#remove()">remove</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retrieves and removes the head of this queue.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_com.google.common.collect.ForwardingCollection"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.google.common.collect.<A HREF="../../../../com/google/common/collect/ForwardingCollection.html" title="class in com.google.common.collect">ForwardingCollection</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/google/common/collect/ForwardingCollection.html#add(E)">add</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#addAll(java.util.Collection)">addAll</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#clear()">clear</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#contains(java.lang.Object)">contains</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#containsAll(java.util.Collection)">containsAll</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#isEmpty()">isEmpty</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#iterator()">iterator</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#remove(java.lang.Object)">remove</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#removeAll(java.util.Collection)">removeAll</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#retainAll(java.util.Collection)">retainAll</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#size()">size</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#toArray()">toArray</A>, <A HREF="../../../../com/google/common/collect/ForwardingCollection.html#toArray(T[])">toArray</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_com.google.common.collect.ForwardingObject"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.google.common.collect.<A HREF="../../../../com/google/common/collect/ForwardingObject.html" title="class in com.google.common.collect">ForwardingObject</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/google/common/collect/ForwardingObject.html#toString()">toString</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" 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/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.util.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 java.util.<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#add(E)" title="class or interface in java.util">add</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<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/javase/6/docs/api/java/util/Collection.html?is-external=true" 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/javase/6/docs/api/java/util/Collection.html?is-external=true#addAll(java.util.Collection)" title="class or interface in java.util">addAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#clear()" title="class or interface in java.util">clear</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#contains(java.lang.Object)" title="class or interface in java.util">contains</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#containsAll(java.util.Collection)" title="class or interface in java.util">containsAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.util">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#hashCode()" title="class or interface in java.util">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#isEmpty()" title="class or interface in java.util">isEmpty</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#iterator()" title="class or interface in java.util">iterator</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#remove(java.lang.Object)" title="class or interface in java.util">remove</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#removeAll(java.util.Collection)" title="class or interface in java.util">removeAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#retainAll(java.util.Collection)" title="class or interface in java.util">retainAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#size()" title="class or interface in java.util">size</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#toArray()" title="class or interface in java.util">toArray</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true#toArray(T[])" title="class or interface in java.util">toArray</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="ForwardingQueue()"><!-- --></A><H3>
ForwardingQueue</H3>
<PRE>
public <B>ForwardingQueue</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="delegate()"><!-- --></A><H3>
delegate</H3>
<PRE>
protected abstract <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt; <B>delegate</B>()</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../com/google/common/collect/ForwardingObject.html#delegate()">ForwardingObject</A></CODE></B></DD>
<DD>Returns the backing delegate instance that methods are forwarded to.
Abstract subclasses generally override this method with an abstract method
that has a more specific return type, such as <A HREF="../../../../com/google/common/collect/ForwardingSet.html#delegate()"><CODE>ForwardingSet.delegate()</CODE></A>. Concrete subclasses override this method to supply
the instance being decorated.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/google/common/collect/ForwardingCollection.html#delegate()">delegate</A></CODE> in class <CODE><A HREF="../../../../com/google/common/collect/ForwardingCollection.html" title="class in com.google.common.collect">ForwardingCollection</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="offer(java.lang.Object)"><!-- --></A><A NAME="offer(E)"><!-- --></A><H3>
offer</H3>
<PRE>
public boolean <B>offer</B>(<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&nbsp;o)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#offer(E)" title="class or interface in java.util">java.util.Queue</A></CODE></B></DD>
<DD>Inserts the specified element into this queue if it is possible to do
so immediately without violating capacity restrictions.
When using a capacity-restricted queue, this method is generally
preferable to <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#add(E)" title="class or interface in java.util"><CODE>Queue.add(E)</CODE></A>, which can fail to insert an element only
by throwing an exception.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#offer(E)" title="class or interface in java.util">offer</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - the element to add
<DT><B>Returns:</B><DD><tt>true</tt> if the element was added to this queue, else
<tt>false</tt></DL>
</DD>
</DL>
<HR>
<A NAME="poll()"><!-- --></A><H3>
poll</H3>
<PRE>
public <A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A> <B>poll</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#poll()" title="class or interface in java.util">java.util.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="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#poll()" title="class or interface in java.util">poll</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</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="remove()"><!-- --></A><H3>
remove</H3>
<PRE>
public <A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A> <B>remove</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#remove()" title="class or interface in java.util">java.util.Queue</A></CODE></B></DD>
<DD>Retrieves and removes the head of this queue. This method differs
from <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#poll()" title="class or interface in java.util"><CODE>poll</CODE></A> only in that it throws an exception if this
queue is empty.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#remove()" title="class or interface in java.util">remove</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the head of this queue</DL>
</DD>
</DL>
<HR>
<A NAME="peek()"><!-- --></A><H3>
peek</H3>
<PRE>
public <A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A> <B>peek</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#peek()" title="class or interface in java.util">java.util.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="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#peek()" title="class or interface in java.util">peek</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</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="element()"><!-- --></A><H3>
element</H3>
<PRE>
public <A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A> <B>element</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#element()" title="class or interface in java.util">java.util.Queue</A></CODE></B></DD>
<DD>Retrieves, but does not remove, the head of this queue. This method
differs from <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#peek()" title="class or interface in java.util"><CODE>peek</CODE></A> only in that it throws an exception
if this queue is empty.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true#element()" title="class or interface in java.util">element</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</A>&lt;<A HREF="../../../../com/google/common/collect/ForwardingQueue.html" title="type parameter in ForwardingQueue">E</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the head of this queue</DL>
</DD>
</DL>
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