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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Fri Aug 23 13:18:10 EDT 2002 --><TITLE>: Interface PriorityQueue</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <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="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=../copyright.html target=_top>© 1998-2002 McGraw-Hill</a></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../structure/OrderedStructure.html"><B>PREV CLASS</B></A> <A HREF="../structure/Queue.html"><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="PriorityQueue.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">structure</FONT><BR>Interface PriorityQueue</H2><DL><DT><B>All Known Subinterfaces:</B> <DD><A HREF="../structure/MergeableHeap.html">MergeableHeap</A></DD></DL><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../structure/VectorHeap.html">VectorHeap</A>, <A HREF="../structure/SkewHeap.html">SkewHeap</A>, <A HREF="../structure/PriorityVector.html">PriorityVector</A></DD></DL><HR><DL><DT>public interface <B>PriorityQueue</B></DL><P>Interface describing an queue of prioritized values. This linear-like structure has values that are inserted in such a way as to allow them to be removed in increasing order. <P> Example usage: <P> To print out a list of programmers sorted by age we could use the following: <pre> public static void main(String[] argv){ //initialize a new fib heap <A HREF="../structure/PriorityQueue.html"><CODE>PriorityQueue</CODE></A> programmers = new <CODE>FibHeap()</CODE>; //add programmers and their ages to heap //ages current of 7/22/2002 programmers.<A HREF="../structure/PriorityQueue.html#add(java.lang.Comparable)"><CODE>add(new ComparableAssociation(new Integer(22), "Evan"))</CODE></A>; programmers.add(new ComparableAssociation(new Integer(19), "Chris")); programmers.add(new ComparableAssociation(new Integer(20), "Shimon")); programmers.add(new ComparableAssociation(new Integer(21), "Diane")); programmers.add(new ComparableAssociation(new Integer(21), "Lida")); programmers.add(new ComparableAssociation(new Integer(20), "Rob")); programmers.add(new ComparableAssociation(new Integer(20), "Sean")); //print out programmers while(!programmers.<A HREF="../structure/PriorityQueue.html#isEmpty()"><CODE>isEmpty()</CODE></A>){ ComparableAssociation p = (ComparableAssociation)programmers.<A HREF="../structure/PriorityQueue.html#remove()"><CODE>remove()</CODE></A>; System.out.println(p.getValue() + " is " + p.getKey() + " years old."); } } </pre><P><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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="../structure/PriorityQueue.html#add(java.lang.Comparable)">add</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Comparable.html">Comparable</A> value)</CODE><BR> Add a value to the priority 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="../structure/PriorityQueue.html#clear()">clear</A></B>()</CODE><BR> Remove all the elements from the 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/1.3/docs/api/java/lang/Comparable.html">Comparable</A></CODE></FONT></TD><TD><CODE><B><A HREF="../structure/PriorityQueue.html#getFirst()">getFirst</A></B>()</CODE><BR> Fetch lowest valued (highest priority) item from 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="../structure/PriorityQueue.html#isEmpty()">isEmpty</A></B>()</CODE><BR> Determine if the 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/1.3/docs/api/java/lang/Comparable.html">Comparable</A></CODE></FONT></TD><TD><CODE><B><A HREF="../structure/PriorityQueue.html#remove()">remove</A></B>()</CODE><BR> Returns the minimum value from the queue.</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="../structure/PriorityQueue.html#size()">size</A></B>()</CODE><BR> Determine the size of the queue.</TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="getFirst()"><!-- --></A><H3>getFirst</H3><PRE>public <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Comparable.html">Comparable</A> <B>getFirst</B>()</PRE><DL><DD>Fetch lowest valued (highest priority) item from queue.<DD><DL><DT><B>Precondition:</B><DD>!isEmpty()<DT><B>Postcondition:</B><DD>returns the minimum value in priority queue<DT><B>Returns:</B><DD>The smallest value from queue.</DL></DD></DL><HR><A NAME="remove()"><!-- --></A><H3>remove</H3><PRE>public <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Comparable.html">Comparable</A> <B>remove</B>()</PRE><DL><DD>Returns the minimum value from the queue.<DD><DL><DT><B>Precondition:</B><DD>!isEmpty()<DT><B>Postcondition:</B><DD>returns and removes minimum value from queue<DT><B>Returns:</B><DD>The minimum value in the queue.</DL></DD></DL><HR><A NAME="add(java.lang.Comparable)"><!-- --></A><H3>add</H3><PRE>public void <B>add</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Comparable.html">Comparable</A> value)</PRE><DL><DD>Add a value to the priority queue.<DD><DL><DT><B>Parameters:</B><DD><CODE>value</CODE> - The value to be added.<DT><B>Precondition:</B><DD>value is non-null comparable<DT><B>Postcondition:</B><DD>value is added to priority queue</DL></DD></DL><HR><A NAME="isEmpty()"><!-- --></A><H3>isEmpty</H3><PRE>public boolean <B>isEmpty</B>()</PRE><DL><DD>Determine if the queue is empty.<DD><DL><DT><B>Postcondition:</B><DD>returns true iff no elements are in queue<DT><B>Returns:</B><DD>True if the queue is empty.</DL></DD></DL><HR><A NAME="size()"><!-- --></A><H3>size</H3><PRE>public int <B>size</B>()</PRE><DL><DD>Determine the size of the queue.<DD><DL><DT><B>Postcondition:</B><DD>returns number of elements within queue<DT><B>Returns:</B><DD>The number of elements within the queue.</DL></DD></DL><HR><A NAME="clear()"><!-- --></A><H3>clear</H3><PRE>public void <B>clear</B>()</PRE><DL><DD>Remove all the elements from the queue.<DD><DL><DT><B>Postcondition:</B><DD>removes all elements from queue</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <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="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=../copyright.html target=_top>© 1998-2002 McGraw-Hill</a></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../structure/OrderedStructure.html"><B>PREV CLASS</B></A> <A HREF="../structure/Queue.html"><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="PriorityQueue.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A 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