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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 09:53:09 CST 2005 --><META http-equiv="Content-Type" content="text/html; charset=gb2312"><TITLE>接口 java.util.concurrent.Future 的使用 (Java 2 Platform SE 5.0)</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="接口 java.util.concurrent.Future 的使用 (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" 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BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">使用 <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A> 的软件包</FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><A HREF="#java.util.concurrent"><B>java.util.concurrent</B></A></TD><TD> 在并发编程中很常用的实用工具类。 </TD></TR></TABLE> <P><A NAME="java.util.concurrent"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><A HREF="../package-summary.html">java.util.concurrent</A> 中 <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A> 的使用</FONT></TH></TR></TABLE> <P><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TH ALIGN="left" COLSPAN="2"><A HREF="../package-summary.html">java.util.concurrent</A> 中 <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A> 的子接口</FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> interface</CODE></FONT></TD><TD><CODE><B><A HREF="../ScheduledFuture.html" title="java.util.concurrent 中的接口">ScheduledFuture<V></A></B></CODE><BR> 一个延迟的、结果可接受的操作，可将其取消。</TD></TR></TABLE> <P><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TH ALIGN="left" COLSPAN="2">实现 <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A> 的 <A HREF="../package-summary.html">java.util.concurrent</A> 中的类</FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> class</CODE></FONT></TD><TD><CODE><B><A HREF="../FutureTask.html" title="java.util.concurrent 中的类">FutureTask<V></A></B></CODE><BR> 可取消的异步计算。</TD></TR></TABLE> <P><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TH ALIGN="left" COLSPAN="2">返回 <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A> 的 <A HREF="../package-summary.html">java.util.concurrent</A> 中的方法</FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../ExecutorCompletionService.html" title="ExecutorCompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>ExecutorCompletionService.</B><B><A HREF="../ExecutorCompletionService.html#poll()">poll</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../CompletionService.html" title="CompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>CompletionService.</B><B><A HREF="../CompletionService.html#poll()">poll</A></B>()</CODE><BR> 检索并移除表示下一个已完成任务的 Future，如果不存在这样的任务，则返回 <tt>null</tt>。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../ExecutorCompletionService.html" title="ExecutorCompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>ExecutorCompletionService.</B><B><A HREF="../ExecutorCompletionService.html#poll(long, java.util.concurrent.TimeUnit)">poll</A></B>(long timeout, <A HREF="../TimeUnit.html" title="java.util.concurrent 中的枚举">TimeUnit</A> unit)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../CompletionService.html" title="CompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>CompletionService.</B><B><A HREF="../CompletionService.html#poll(long, java.util.concurrent.TimeUnit)">poll</A></B>(long timeout, <A HREF="../TimeUnit.html" title="java.util.concurrent 中的枚举">TimeUnit</A> unit)</CODE><BR> 检索并移除表示下一个已完成任务的 Future，如果目前不存在这样的任务，则将等待指定的时间（如果有必要）。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""><TR ALIGN="right" VALIGN=""><TD NOWRAP><FONT SIZE="-1"><CODE><T> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><T></CODE></FONT></TD></TR></TABLE></CODE></FONT></TD><TD><CODE><B>ScheduledThreadPoolExecutor.</B><B><A HREF="../ScheduledThreadPoolExecutor.html#submit(java.util.concurrent.Callable)">submit</A></B>(<A HREF="../Callable.html" title="java.util.concurrent 中的接口">Callable</A><T> task)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""><TR ALIGN="right" VALIGN=""><TD NOWRAP><FONT SIZE="-1"><CODE><T> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><T></CODE></FONT></TD></TR></TABLE></CODE></FONT></TD><TD><CODE><B>ExecutorService.</B><B><A HREF="../ExecutorService.html#submit(java.util.concurrent.Callable)">submit</A></B>(<A HREF="../Callable.html" title="java.util.concurrent 中的接口">Callable</A><T> task)</CODE><BR> 提交一个返回值的任务用于执行，返回一个表示任务的未决结果的 Future。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""><TR ALIGN="right" VALIGN=""><TD NOWRAP><FONT SIZE="-1"><CODE><T> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><T></CODE></FONT></TD></TR></TABLE></CODE></FONT></TD><TD><CODE><B>AbstractExecutorService.</B><B><A HREF="../AbstractExecutorService.html#submit(java.util.concurrent.Callable)">submit</A></B>(<A HREF="../Callable.html" title="java.util.concurrent 中的接口">Callable</A><T> task)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../ExecutorCompletionService.html" title="ExecutorCompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>ExecutorCompletionService.</B><B><A HREF="../ExecutorCompletionService.html#submit(java.util.concurrent.Callable)">submit</A></B>(<A HREF="../Callable.html" title="java.util.concurrent 中的接口">Callable</A><<A HREF="../ExecutorCompletionService.html" title="ExecutorCompletionService 中的类型参数">V</A>> task)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><<A HREF="../CompletionService.html" title="CompletionService 中的类型参数">V</A>></CODE></FONT></TD><TD><CODE><B>CompletionService.</B><B><A HREF="../CompletionService.html#submit(java.util.concurrent.Callable)">submit</A></B>(<A HREF="../Callable.html" title="java.util.concurrent 中的接口">Callable</A><<A HREF="../CompletionService.html" title="CompletionService 中的类型参数">V</A>> task)</CODE><BR> 提交要执行的值返回任务，并返回表示挂起的任务结果的 Future。</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../Future.html" title="java.util.concurrent 中的接口">Future</A><?></CODE></FONT></TD><TD><CODE><B>ScheduledThreadPoolExecutor.</B><B><A HREF="../ScheduledThreadPoolExecutor.html#submit(java.lang.Runnable)">submit</A></B>(<A HREF="../../../lang/Runnable.html" title="java.lang 中的接口">Runnable</A> task)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor">⌨️ 快捷键说明
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