retentionpolicy.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 09:50:11 CST 2005 --><META http-equiv="Content-Type" content="text/html; charset=gb2312"><TITLE>RetentionPolicy (Java 2 Platform SE 5.0)</TITLE><META NAME="keywords" CONTENT="java.lang.annotation.RetentionPolicy class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){    parent.document.title="RetentionPolicy (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/RetentionPolicy.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="Retention.html" title="java.lang.annotation 中的注释"><B>上一个类</B></A>&nbsp;&nbsp;<A HREF="Target.html" title="java.lang.annotation 中的注释"><B>下一个类</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">  <A HREF="../../../index.html@java_2Flang_2Fannotation_2FRetentionPolicy.html" target="_top"><B>框架</B></A>  &nbsp;&nbsp;<A HREF="RetentionPolicy.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="#enum_constant_summary">枚举常量</A>&nbsp;|&nbsp;字段&nbsp;|&nbsp;<A HREF="#method_summary">方法</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">详细信息:&nbsp;<A HREF="#enum_constant_detail">枚举常量</A>&nbsp;|&nbsp;字段&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.lang.annotation</FONT><BR>枚举 RetentionPolicy</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="../Enum.html" title="java.lang 中的类">java.lang.Enum</A>&lt;<A HREF="RetentionPolicy.html" title="java.lang.annotation 中的枚举">RetentionPolicy</A>&gt;      <IMG SRC="../../../resources/inherit.gif" ALT="继承者 "><B>java.lang.annotation.RetentionPolicy</B></PRE><DL><DT><B>所有已实现的接口:</B> <DD>java.io.Serializable, <A HREF="../Comparable.html" title="java.lang 中的接口">Comparable</A>&lt;<A HREF="RetentionPolicy.html" title="java.lang.annotation 中的枚举">RetentionPolicy</A>&gt;</DD></DL><HR><DL><DT><PRE>public enum <B>RetentionPolicy</B><DT>extends <A HREF="../Enum.html" title="java.lang 中的类">Enum</A>&lt;<A HREF="RetentionPolicy.html" title="java.lang.annotation 中的枚举">RetentionPolicy</A>&gt;</DL></PRE><P>注释保留策略。此枚举类型的常量描述保留注释的不同策略。它们与 <A HREF="Retention.html" title="java.lang.annotation 中的注释"><CODE>Retention</CODE></A> 元注释类型一起使用,以指定保留多长的注释。<P><P><DL><DT><B>从以下版本开始:</B></DT>  <DD>1.5</DD></DL><HR><P><!-- =========== ENUM CONSTANT SUMMARY =========== --><A NAME="enum_constant_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>枚举常量摘要</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="RetentionPolicy.html#CLASS">CLASS</A></B></CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;编译器将把注释记录在类文件中,但在运行时 VM 不需要保留注释。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="RetentionPolicy.html#RUNTIME">RUNTIME</A></B></CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;编译器将把注释记录在类文件中,在运行时 VM 将保留注释,因此可以反射性地读取。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="RetentionPolicy.html#SOURCE">SOURCE</A></B></CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;编译器要丢弃的注释。</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>static&nbsp;<A HREF="RetentionPolicy.html" title="java.lang.annotation 中的枚举">RetentionPolicy</A></CODE></FONT></TD><TD><CODE><B><A HREF="RetentionPolicy.html#valueOf(java.lang.String)">valueOf</A></B>(<A HREF="../String.html" title="java.lang 中的类">String</A>&nbsp;name)</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回带有指定名称的该类型的枚举常量。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static&nbsp;<A HREF="RetentionPolicy.html" title="java.lang.annotation 中的枚举">RetentionPolicy</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="RetentionPolicy.html#values()">values</A></B>()</CODE><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;按照声明该枚举类型的常量的顺序,返回包含这些常量的数组。</TD></TR></TABLE>&nbsp;<A NAME="methods_inherited_from_class_java.lang.Enum"><!-- --></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="../Enum.html" title="java.lang 中的类">Enum</A> 继承的方法</B></TH></TR>

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