weakreference.html
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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 09:50:17 CST 2005 --><META http-equiv="Content-Type" content="text/html; charset=gb2312"><TITLE>WeakReference (Java 2 Platform SE 5.0)</TITLE><META NAME="keywords" CONTENT="java.lang.ref.WeakReference class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="WeakReference (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> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>软件包</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>类</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/WeakReference.html"><FONT CLASS="NavBarFont1"><B>使用</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>树</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>已过时</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>索引</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>帮助</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Standard Ed. 5.0</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="SoftReference.html" title="java.lang.ref 中的类"><B>上一个类</B></A> 下一个类</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html@java_2Flang_2Fref_2FWeakReference.html" target="_top"><B>框架</B></A> <A HREF="WeakReference.html" target="_top"><B>无框架</B></A> <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： 嵌套 | 字段 | <A HREF="#constructor_summary">构造方法</A> | <A HREF="#methods_inherited_from_class_java.lang.ref.Reference">方法</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">详细信息： 字段 | <A HREF="#constructor_detail">构造方法</A> | 方法</FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.lang.ref</FONT><BR>类 WeakReference<T></H2><PRE><A HREF="../Object.html" title="java.lang 中的类">java.lang.Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="继承者 "><A HREF="Reference.html" title="java.lang.ref 中的类">java.lang.ref.Reference</A><T> <IMG SRC="../../../resources/inherit.gif" ALT="继承者 "><B>java.lang.ref.WeakReference<T></B></PRE><HR><DL><DT><PRE>public class <B>WeakReference<T></B><DT>extends <A HREF="Reference.html" title="java.lang.ref 中的类">Reference</A><T></DL></PRE><P>弱引用对象，它们并不禁止其指示对象变得可终结，并被终结，然后被回收。弱引用最常用于实现规范化的映射。<p> 假定垃圾回收器确定在某一时间点上某个对象是<a href="package-summary.html#reachability">弱可到达对象</a>。这时，它将自动清除针对此对象的所有弱引用，以及通过强引用链和软引用，可以从其到达该对象的针对任何其他弱可到达对象的所有弱引用。同时它将声明所有以前的弱可到达对象为可终结的。在同一时间或晚些时候，它将那些已经向引用队列注册的新清除的弱引用加入队列。<P><P><DL><DT><B>从以下版本开始：</B></DT> <DD>1.2</DD></DL><HR><P><!-- ======== 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="WeakReference.html#WeakReference(T)">WeakReference</A></B>(<A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A> referent)</CODE><BR> 创建引用给定对象的新的弱引用。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="WeakReference.html#WeakReference(T, java.lang.ref.ReferenceQueue)">WeakReference</A></B>(<A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A> referent, <A HREF="ReferenceQueue.html" title="java.lang.ref 中的类">ReferenceQueue</A><? super <A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A>> q)</CODE><BR> 创建引用给定对象的新的弱引用，并向给定队列注册该引用。</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"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>方法摘要</B></FONT></TH></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.ref.Reference"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>从类 java.lang.ref.<A HREF="Reference.html" title="java.lang.ref 中的类">Reference</A> 继承的方法</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="Reference.html#clear()">clear</A>, <A HREF="Reference.html#enqueue()">enqueue</A>, <A HREF="Reference.html#get()">get</A>, <A HREF="Reference.html#isEnqueued()">isEnqueued</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>从类 java.lang.<A HREF="../Object.html" title="java.lang 中的类">Object</A> 继承的方法</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../Object.html#clone()">clone</A>, <A HREF="../Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../Object.html#finalize()">finalize</A>, <A HREF="../Object.html#getClass()">getClass</A>, <A HREF="../Object.html#hashCode()">hashCode</A>, <A HREF="../Object.html#notify()">notify</A>, <A HREF="../Object.html#notifyAll()">notifyAll</A>, <A HREF="../Object.html#toString()">toString</A>, <A HREF="../Object.html#wait()">wait</A>, <A HREF="../Object.html#wait(long)">wait</A>, <A HREF="../Object.html#wait(long, int)">wait</A></CODE></TD></TR></TABLE> <P><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>构造方法详细信息</B></FONT></TH></TR></TABLE><A NAME="WeakReference(java.lang.Object)"><!-- --></A><A NAME="WeakReference(T)"><!-- --></A><H3>WeakReference</H3><PRE>public <B>WeakReference</B>(<A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A> referent)</PRE><DL><DD>创建引用给定对象的新的弱引用。新的引用没有向任何队列注册。<P><DL><DT><B>参数：</B><DD><CODE>referent</CODE> - 新的弱引用将引用的对象</DL></DL><HR><A NAME="WeakReference(java.lang.Object,java.lang.ref.ReferenceQueue)"><!-- --></A><A NAME="WeakReference(T, java.lang.ref.ReferenceQueue)"><!-- --></A><H3>WeakReference</H3><PRE>public <B>WeakReference</B>(<A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A> referent, <A HREF="ReferenceQueue.html" title="java.lang.ref 中的类">ReferenceQueue</A><? super <A HREF="WeakReference.html" title="WeakReference 中的类型参数">T</A>> q)</PRE><DL><DD>创建引用给定对象的新的弱引用，并向给定队列注册该引用。<P><DL><DT><B>参数：</B><DD><CODE>referent</CODE> - 新的弱引用将引用的对象<DD><CODE>q</CODE> - 该引用向其注册的队列；如果不需要注册，则为 <tt>null</tt></DL></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" 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_bottom_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> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>软件包</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>类</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/WeakReference.html"><FONT CLASS="NavBarFont1"><B>使用</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>树</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>已过时</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>索引</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>帮助</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Standard Ed. 5.0</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="SoftReference.html" title="java.lang.ref 中的类"><B>上一个类</B></A> 下一个类</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html@java_2Flang_2Fref_2FWeakReference.html" target="_top"><B>框架</B></A> <A HREF="WeakReference.html" target="_top"><B>无框架</B></A> <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： 嵌套 | 字段 | <A HREF="#constructor_summary">构造方法</A> | <A HREF="#methods_inherited_from_class_java.lang.ref.Reference">方法</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">详细信息： 字段 | <A HREF="#constructor_detail">构造方法</A> | 方法</FONT></TD></TR></TABLE><A NAME="skip-navbar_bottom"></A><!-- ======== END OF BOTTOM NAVBAR ======= --><HR><font size="-1"><a href="../../../../../../../../../java.sun.com/cgi-bin/bugreport.cgi">提交错误或意见</a><br>有关更多的 API 参考资料和开发人员文档，请参阅 <a href="../../../../../../../../../java.sun.com/j2se/1.5.0/docs/relnotes/devdocs-vs-specs.html">Java 2 SDK SE 开发人员文档</a>。该文档包含更详细的、面向开发人员的描述，以及总体概述、术语定义、使用技巧和工作代码示例。 <p>版权所有 2004 Sun Microsystems, Inc. 保留所有权利。 请遵守<a href="../../../../../../../../../java.sun.com/j2se/1.5.0/docs/relnotes/license.html">许可证条款</a>。另请参阅<a href="../../../../../../../../../java.sun.com/docs/redist.html">文档重新分发政策</a>。</font></BODY></HTML>⌨️ 快捷键说明
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