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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 13:18:21 EDT 2002 --><TITLE>: Class VectorHeap</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/Vector.html"><B>PREV CLASS</B></A> <A HREF="../structure/VectorIterator.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="VectorHeap.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <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>Class VectorHeap</H2><PRE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">java.lang.Object</A> | +--<B>structure.VectorHeap</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../structure/PriorityQueue.html">PriorityQueue</A></DD></DL><HR><DL><DT>public class <B>VectorHeap</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A><DT>implements <A HREF="../structure/PriorityQueue.html">PriorityQueue</A></DL><P>This class implements a priority queue based on a traditional array-based heap. Most heap operations, including insert and remove, execute in logarithmic time, but the minimum element can be returned in constant time. <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 VectorHeap programmers = new <A HREF="../structure/VectorHeap.html#VectorHeap()"><CODE>VectorHeap()</CODE></A>; //add programmers and their ages to heap //ages current of 7/22/2002 //add programmers and their ages to heap //ages current of 7/22/2002 programmers.<A HREF="../structure/VectorHeap.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/VectorHeap.html#isEmpty()"><CODE>isEmpty()</CODE></A>){ ComparableAssociation p = (ComparableAssociation)programmers.<A HREF="../structure/VectorHeap.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 =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../structure/Vector.html">Vector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#data">data</A></B></CODE><BR> The data, kept in heap order.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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="../structure/VectorHeap.html#VectorHeap()">VectorHeap</A></B>()</CODE><BR> Construct a new priority queue</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../structure/VectorHeap.html#VectorHeap(structure.Vector)">VectorHeap</A></B>(<A HREF="../structure/Vector.html">Vector</A> v)</CODE><BR> Construct a new priority queue from an unordered vector</TD></TR></TABLE> <!-- ========== 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/VectorHeap.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/VectorHeap.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/VectorHeap.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/VectorHeap.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>protected static int</CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#left(int)">left</A></B>(int i)</CODE><BR> Returns left child index.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static int</CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#parent(int)">parent</A></B>(int i)</CODE><BR> Returns parent index</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#percolateUp(int)">percolateUp</A></B>(int leaf)</CODE><BR> Moves node upward to appropriate position within heap.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#pushDownRoot(int)">pushDownRoot</A></B>(int root)</CODE><BR> Moves node downward, into appropriate position within subheap.</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/VectorHeap.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>protected static int</CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#right(int)">right</A></B>(int i)</CODE><BR> Returns right child index.</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/VectorHeap.html#size()">size</A></B>()</CODE><BR> Determine the size of 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/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../structure/VectorHeap.html#toString()">toString</A></B>()</CODE><BR> Construct a string representation of the heap.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#<clinit>()"><clinit></A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#clone()">clone</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#finalize()">finalize</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#getClass()">getClass</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notify()">notify</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#registerNatives()">registerNatives</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait()">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long)">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long, int)">wait</A></CODE></TD></TR></TABLE> <P>⌨️ 快捷键说明
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