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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><TITLE>Dlist (Project JXTA J2SE)</TITLE><META NAME="keywords" CONTENT="net.jxta.impl.util.Dlist class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Dlist (Project JXTA J2SE)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Dlist.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><a href='http://www.jxta.org' target='_blank'>Project JXTA</a></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util"><B>PREV CLASS</B></A> <A HREF="../../../../net/jxta/impl/util/DynamicEnumeration.html" title="class in net.jxta.impl.util"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="Dlist.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">net.jxta.impl.util</FONT><BR>Class Dlist</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">net.jxta.impl.util.Dlink</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>net.jxta.impl.util.Dlist</B></PRE><HR><DL><DT>public class <B>Dlist</B><DT>extends <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></DL><P>A cheap doubly linked list. It is far less general than java's LinkedList but permits much better removal performance from the middle of the list because a contained element and the corresponding chaining object are one and the same. The major inconvenient of Dlink is that it is a class, not an interface. Making it an interface does not make sense since one would have to re-implement it entirely. A DList is just a stand-alone Dlink with just a couple of additional convenience methods. Note this class does not keep an element count. The way element removal works makes it impossible. Do it from the outside.<P><P><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#Dlist()">Dlist</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></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="../../../../net/jxta/impl/util/Dlist.html#addFirst(net.jxta.impl.util.Dlink)">addFirst</A></B>(<A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A> ne)</CODE><BR> </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="../../../../net/jxta/impl/util/Dlist.html#addLast(net.jxta.impl.util.Dlink)">addLast</A></B>(<A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A> ne)</CODE><BR> </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="../../../../net/jxta/impl/util/Dlist.html#clear()">clear</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#first()">first</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#getFirst()">getFirst</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#getLast()">getLast</A></B>()</CODE><BR> </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="../../../../net/jxta/impl/util/Dlist.html#isEmpty()">isEmpty</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#last()">last</A></B>()</CODE><BR> </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="../../../../net/jxta/impl/util/Dlist.html#putFirst(net.jxta.impl.util.Dlink)">putFirst</A></B>(<A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A> ne)</CODE><BR> </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="../../../../net/jxta/impl/util/Dlist.html#putLast(net.jxta.impl.util.Dlink)">putLast</A></B>(<A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A> ne)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#removeFirst()">removeFirst</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/impl/util/Dlink.html" title="class in net.jxta.impl.util">Dlink</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/util/Dlist.html#removeLast()">removeLast</A></B>()</CODE><BR> </TD></TR></TABLE> <A NAME="methods_inherited_from_class_net.jxta.impl.util.Dlink"><!-- 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