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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><!-- Generated by javadoc (build 1.5.0_03) on Wed Nov 02 09:51:17 CST 2005 --><META http-equiv="Content-Type" content="text/html; charset=gb2312"><TITLE>Stack (Java 2 Platform SE 5.0)</TITLE><META NAME="keywords" CONTENT="java.util.Stack class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){    parent.document.title="Stack (Java 2 Platform SE 5.0)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="跳过导航链接"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 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>概述</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>软件包</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>类</B></FONT>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Stack.html"><FONT CLASS="NavBarFont1"><B>使用</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>树</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>已过时</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>索引</B></FONT></A>&nbsp;</TD>  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>帮助</B></FONT></A>&nbsp;</TD>  </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup>&nbsp;2&nbsp;Platform<br>Standard&nbsp;Ed. 5.0</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">&nbsp;<A HREF="SortedSet.html" title="java.util 中的接口"><B>上一个类</B></A>&nbsp;&nbsp;<A HREF="StringTokenizer.html" title="java.util 中的类"><B>下一个类</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">  <A HREF="../../index.html@java_2Futil_2FStack.html" target="_top"><B>框架</B></A>  &nbsp;&nbsp;<A HREF="Stack.html" target="_top"><B>无框架</B></A>  &nbsp;&nbsp;<SCRIPT type="text/javascript">  <!--  if(window==top) {    document.writeln('<A HREF="../../allclasses-noframe.html"><B>所有类</B></A>');  }  //--></SCRIPT><NOSCRIPT>  <A HREF="../../allclasses-noframe.html"><B>所有类</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">  摘要:&nbsp;嵌套&nbsp;|&nbsp;<A HREF="#fields_inherited_from_class_java.util.Vector">字段</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">构造方法</A>&nbsp;|&nbsp;<A HREF="#method_summary">方法</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">详细信息:&nbsp;字段&nbsp;|&nbsp;<A HREF="#constructor_detail">构造方法</A>&nbsp;|&nbsp;<A HREF="#method_detail">方法</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.util</FONT><BR>类 Stack&lt;E&gt;</H2><PRE><A HREF="../lang/Object.html" title="java.lang 中的类">java.lang.Object</A>  <IMG SRC="../../resources/inherit.gif" ALT="继承者 "><A HREF="AbstractCollection.html" title="java.util 中的类">java.util.AbstractCollection</A>&lt;E&gt;      <IMG SRC="../../resources/inherit.gif" ALT="继承者 "><A HREF="AbstractList.html" title="java.util 中的类">java.util.AbstractList</A>&lt;E&gt;          <IMG SRC="../../resources/inherit.gif" ALT="继承者 "><A HREF="Vector.html" title="java.util 中的类">java.util.Vector</A>&lt;E&gt;              <IMG SRC="../../resources/inherit.gif" ALT="继承者 "><B>java.util.Stack&lt;E&gt;</B></PRE><DL><DT><B>所有已实现的接口:</B> <DD>java.io.Serializable, <A HREF="../lang/Cloneable.html" title="java.lang 中的接口">Cloneable</A>, <A HREF="../lang/Iterable.html" title="java.lang 中的接口">Iterable</A>&lt;E&gt;, <A HREF="Collection.html" title="java.util 中的接口">Collection</A>&lt;E&gt;, <A HREF="List.html" title="java.util 中的接口">List</A>&lt;E&gt;, <A HREF="RandomAccess.html" title="java.util 中的接口">RandomAccess</A></DD></DL><HR><DL><DT><PRE>public class <B>Stack&lt;E&gt;</B><DT>extends <A HREF="Vector.html" title="java.util 中的类">Vector</A>&lt;E&gt;</DL></PRE><P><code>Stack</code> 类表示后进先出(LIFO)的对象堆栈。它通过五个操作对类 <tt>Vector</tt> 进行了扩展 ,允许将向量视为堆栈。它提供了通常的 <tt>push</tt> 和 <tt>pop</tt> 操作,以及取栈顶点的 <tt>peek</tt> 方法、测试堆栈是否为空的 <tt>empty</tt> 方法、在堆栈中查找项并确定到栈顶距离的 <tt>search</tt> 方法。<p>首次创建堆栈时,它不包含数据项。<P><P><DL><DT><B>从以下版本开始:</B></DT>  <DD>JDK1.0</DD><DT><B>另请参见:</B><DD><A HREF="../../serialized-form.html#java.util.Stack">序列化表格</A></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>字段摘要</B></FONT></TH></TR></TABLE>&nbsp;<A NAME="fields_inherited_from_class_java.util.Vector"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>从类 java.util.<A HREF="Vector.html" title="java.util 中的类">Vector</A> 继承的字段</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="Vector.html#capacityIncrement">capacityIncrement</A>, <A HREF="Vector.html#elementCount">elementCount</A>, <A HREF="Vector.html#elementData">elementData</A></CODE></TD></TR></TABLE>&nbsp;<A NAME="fields_inherited_from_class_java.util.AbstractList"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>从类 java.util.<A HREF="AbstractList.html" title="java.util 中的类">AbstractList</A> 继承的字段</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="AbstractList.html#modCount">modCount</A></CODE></TD></TR></TABLE>&nbsp;<!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>构造方法摘要</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="Stack.html#Stack()">Stack</A></B>()</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建一个空 Stack。</TD></TR></TABLE>&nbsp;<!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>方法摘要</B></FONT></TH></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="Stack.html#empty()">empty</A></B>()</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;测试堆栈是否为空。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>&nbsp;<A HREF="Stack.html" title="Stack 中的类型参数">E</A></CODE></FONT></TD><TD><CODE><B><A HREF="Stack.html#peek()">peek</A></B>()</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;查看栈顶对象而不移除它。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>&nbsp;<A HREF="Stack.html" title="Stack 中的类型参数">E</A></CODE></FONT></TD><TD><CODE><B><A HREF="Stack.html#pop()">pop</A></B>()</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;移除栈顶对象并作为此函数的值返回该对象。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>&nbsp;<A HREF="Stack.html" title="Stack 中的类型参数">E</A></CODE></FONT></TD><TD><CODE><B><A HREF="Stack.html#push(E)">push</A></B>(<A HREF="Stack.html" title="Stack 中的类型参数">E</A>&nbsp;item)</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;把项压入栈顶。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>&nbsp;int</CODE></FONT></TD><TD><CODE><B><A HREF="Stack.html#search(java.lang.Object)">search</A></B>(<A HREF="../lang/Object.html" title="java.lang 中的类">Object</A>&nbsp;o)</CODE><BR>

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