本文介绍了ExecutorCompletionService类的使用方法及其实现原理。通过示例展示了如何利用该类执行并发任务，并提供了构造函数及主要成员函数的说明。
java.util.concurrent
类<wbr style="line-height:25px"><span style="color:#ff00ff; line-height:25px">ExecutorCompletionService</span><wbr style="line-height:25px"><V><br style="line-height:25px"> java.lang.Object<br style="line-height:25px"> 继承者java.util.concurrent.ExecutorCompletionService<V><br style="line-height:25px"> 所有已实现的接口：<br style="line-height:25px"> CompletionService<V><br style="line-height:25px"><wbr style="line-height:25px"><span style="line-height:25px"></span><span style="color:#003366; line-height:25px">它实现了</span><span style="color:#ff6600; line-height:25px">CompletionService</span><span style="color:#003366; line-height:25px">接口，它使用在构造函数中提供的Executor来执行任务的。它会把完成了的任务放一个队列中，外部可以通过</span><span style="color:#0000ff; line-height:25px">take()，poll()，poll(longtimeout,TimeUnitunit)</span><span style="color:#003366; line-height:25px">来取得</span><wbr style="line-height:25px"><span style="color:#003366; line-height:25px">。</span>该类非常轻便，适合于在执行几组任务时临时使用。<br style="line-height:25px"><span style="line-height:25px"><wbr style="line-height:25px">用法示例</wbr></span><wbr style="line-height:25px">。假定您有针对某个问题的一组求解程序，每个求解程序都能返回某种类型的Result值，<br style="line-height:25px"> 并且您想同时运行它们，使用方法use(Resultr)处理返回非null值的每个求解程序的返回结果。<br style="line-height:25px"> 可以这样编写程序：<br style="line-height:25px"><span style="line-height:normal; color:rgb(51,51,51); font-family:arial,sans-serif; font-size:13px"></span> <pre class="prettyprint" style="line-height:inherit; padding-top:10px; padding-right:10px; padding-bottom:10px; padding-left:10px; border-top-width:1px; border-right-width:1px; border-bottom-width:1px; border-left-width:1px; border-top-style:solid; border-right-style:solid; border-bottom-style:solid; border-left-style:solid; border-top-color:rgb(204,204,204); border-right-color:rgb(204,204,204); border-bottom-color:rgb(204,204,204); border-left-color:rgb(204,204,204); color:rgb(0,112,0); font-family:monospace; background-color:rgb(250,250,250); margin-top:0px; margin-bottom:1em; margin-left:1em; overflow-x:auto; overflow-y:auto"><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><code style="line-height:1em; color:rgb(0,112,0); font-family:monospace"><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">void</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solve</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Executor</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Collection</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">throws</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">InterruptedException</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutionException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">CompletionService</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutorCompletionService</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Callable</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> s </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">submit</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">s</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">size</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,102,102)"><span class="lit" style="line-height:23px; color:rgb(0,102,102)">0</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)"><</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">++</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">i</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">take</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">().</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">get</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">use</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span></code><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}}</span></span></pre> </wbr></wbr></wbr></wbr></wbr>假定您想使用任务集中的第一个非null结果，而忽略任何遇到异常的任务，并且在<wbr style="line-height:25px"><span style="color:#333399; line-height:25px">第一个任务完成时取消其他所有任务</span><wbr style="line-height:25px">：<br style="line-height:25px"><span style="line-height:normal; color:rgb(51,51,51); font-family:arial,sans-serif; font-size:13px"></span> <pre class="prettyprint" style="line-height:inherit; padding-top:10px; padding-right:10px; padding-bottom:10px; padding-left:10px; border-top-width:1px; border-right-width:1px; border-bottom-width:1px; border-left-width:1px; border-top-style:solid; border-right-style:solid; border-bottom-style:solid; border-left-style:solid; border-top-color:rgb(204,204,204); border-right-color:rgb(204,204,204); border-bottom-color:rgb(204,204,204); border-left-color:rgb(204,204,204); color:rgb(0,112,0); font-family:monospace; background-color:rgb(250,250,250); margin-top:0px; margin-bottom:1em; margin-left:1em; overflow-x:auto; overflow-y:auto"><code style="line-height:1em; color:rgb(0,112,0); font-family:monospace"><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">void</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solve</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Executor</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Collection</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">throws</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">InterruptedException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">CompletionService</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutorCompletionService</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">size</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">List</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ArrayList</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">>(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">try</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Callable</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> s </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">add</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">submit</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">s</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">));</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,102,102)"><span class="lit" style="line-height:23px; color:rgb(0,102,102)">0</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)"><</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">++</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">i</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">try</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">take</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">().</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">get</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">break</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span></code><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">catch</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutionException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ignore</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">finally</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Future</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> f </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> f</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">cancel</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">true</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">use</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">result</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}}</span></span></pre> <span style="line-height:25px"><wbr style="line-height:25px">主要构造函数</wbr></span><br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">ExecutorCompletionService</span>(Executorexecutor)<wbr style="line-height:25px"><br style="line-height:25px"> 使用为执行基本任务而提供的执行程序创建一个ExecutorCompletionService，并将LinkedBlockingQueue作为完成队列。<br style="line-height:25px"> 参数：<br style="line-height:25px"> executor-要使用的执行程序<br style="line-height:25px"> 抛出：<br style="line-height:25px"> NullPointerException-如果执行程序为null<br style="line-height:25px"><wbr style="line-height:25px"><span style="color:#993300; line-height:25px">public</span><span style="color:#ff6600; line-height:25px">ExecutorCompletionService</span>(Executorexecutor,BlockingQueue<Future<V>>completionQueue)<wbr style="line-height:25px"><br style="line-height:25px"> 使用为执行基本任务而提供的执行程序创建一个ExecutorCompletionService，并将所提供的队列作为其完成队列。<br style="line-height:25px"> 参数：<br style="line-height:25px"> executor-要使用的执行程序<br style="line-height:25px"> completionQueue-用作完成队列的队列，通常是专供此服务使用的队列<br style="line-height:25px"> 抛出：<br style="line-height:25px"> NullPointerException-如果执行程序或completionQueue为null <div style="line-height:25px"> <span style="line-height:25px">主要成员函数</span><br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">submit</span><wbr style="line-height:25px">(Callable<V>task)<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 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。在完成时，可能会提取或轮询此任务。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的submit<br style="line-height:25px"> 参数：<br style="line-height:25px"> task-要提交的任务<br style="line-height:25px"> 返回：<br style="line-height:25px"> 一个表示挂起的任务完成的Future<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><span style="color:#ff6600; line-height:25px"><wbr style="line-height:25px">submit</wbr></span><wbr style="line-height:25px">(Runnabletask,Vresult)<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 提交要执行的Runnable任务，并返回一个表示任务完成的Future，可以提取或轮询此任务。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的submit<br style="line-height:25px"> 参数：<br style="line-height:25px"> task-要提交的任务<br style="line-height:25px"> result-要返回的已成功完成任务的结果<br style="line-height:25px"> 返回：<br style="line-height:25px"> 一个表示挂起的任务完成的Future，其get()方法将返回完成时给出的结果值<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">take()</span><wbr style="line-height:25px"><br style="line-height:25px"> throwsInterruptedException<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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，则等待。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的take<br style="line-height:25px"> 返回：<br style="line-height:25px"> 表示下一个已完成任务的Future<br style="line-height:25px"> 抛出：<br style="line-height:25px"> InterruptedException-如果在等待时被中断<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">poll()</span><wbr style="line-height:25px"><br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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null。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的poll<br style="line-height:25px"> 返回：<br style="line-height:25px"> 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null<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="line-height:25px"></span><span style="color:#ff6600; line-height:25px">poll</span><wbr style="line-height:25px">(longtimeout,<br style="line-height:25px"> TimeUnitunit)<br style="line-height:25px"> throwsInterruptedException<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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）。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的poll<br style="line-height:25px"> 参数：<br style="line-height:25px"> timeout-放弃之前需要等待的时间长度，以unit为时间单位<br style="line-height:25px"> unit-确定如何解释timeout参数的TimeUnit<br style="line-height:25px"> 返回：<br style="line-height:25px"> 表示下一个已完成任务的Future；如果等待了指定时间仍然不存在这样的任务，则返回null<br style="line-height:25px"> 抛出：<br style="line-height:25px"> InterruptedException-如果在等待时被中断</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> </div> </wbr></wbr></wbr></wbr></wbr></wbr>
类<wbr style="line-height:25px"><span style="color:#ff00ff; line-height:25px">ExecutorCompletionService</span><wbr style="line-height:25px"><V><br style="line-height:25px"> java.lang.Object<br style="line-height:25px"> 继承者java.util.concurrent.ExecutorCompletionService<V><br style="line-height:25px"> 所有已实现的接口：<br style="line-height:25px"> CompletionService<V><br style="line-height:25px"><wbr style="line-height:25px"><span style="line-height:25px"></span><span style="color:#003366; line-height:25px">它实现了</span><span style="color:#ff6600; line-height:25px">CompletionService</span><span style="color:#003366; line-height:25px">接口，它使用在构造函数中提供的Executor来执行任务的。它会把完成了的任务放一个队列中，外部可以通过</span><span style="color:#0000ff; line-height:25px">take()，poll()，poll(longtimeout,TimeUnitunit)</span><span style="color:#003366; line-height:25px">来取得</span><wbr style="line-height:25px"><span style="color:#003366; line-height:25px">。</span>该类非常轻便，适合于在执行几组任务时临时使用。<br style="line-height:25px"><span style="line-height:25px"><wbr style="line-height:25px">用法示例</wbr></span><wbr style="line-height:25px">。假定您有针对某个问题的一组求解程序，每个求解程序都能返回某种类型的Result值，<br style="line-height:25px"> 并且您想同时运行它们，使用方法use(Resultr)处理返回非null值的每个求解程序的返回结果。<br style="line-height:25px"> 可以这样编写程序：<br style="line-height:25px"><span style="line-height:normal; color:rgb(51,51,51); font-family:arial,sans-serif; font-size:13px"></span> <pre class="prettyprint" style="line-height:inherit; padding-top:10px; padding-right:10px; padding-bottom:10px; padding-left:10px; border-top-width:1px; border-right-width:1px; border-bottom-width:1px; border-left-width:1px; border-top-style:solid; border-right-style:solid; border-bottom-style:solid; border-left-style:solid; border-top-color:rgb(204,204,204); border-right-color:rgb(204,204,204); border-bottom-color:rgb(204,204,204); border-left-color:rgb(204,204,204); color:rgb(0,112,0); font-family:monospace; background-color:rgb(250,250,250); margin-top:0px; margin-bottom:1em; margin-left:1em; overflow-x:auto; overflow-y:auto"><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><code style="line-height:1em; color:rgb(0,112,0); font-family:monospace"><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">void</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solve</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Executor</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Collection</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">throws</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">InterruptedException</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutionException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">CompletionService</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutorCompletionService</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Callable</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> s </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">submit</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">s</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">size</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,102,102)"><span class="lit" style="line-height:23px; color:rgb(0,102,102)">0</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)"><</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">++</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">i</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">take</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">().</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">get</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">use</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span></code><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}}</span></span></pre> </wbr></wbr></wbr></wbr></wbr>假定您想使用任务集中的第一个非null结果，而忽略任何遇到异常的任务，并且在<wbr style="line-height:25px"><span style="color:#333399; line-height:25px">第一个任务完成时取消其他所有任务</span><wbr style="line-height:25px">：<br style="line-height:25px"><span style="line-height:normal; color:rgb(51,51,51); font-family:arial,sans-serif; font-size:13px"></span> <pre class="prettyprint" style="line-height:inherit; padding-top:10px; padding-right:10px; padding-bottom:10px; padding-left:10px; border-top-width:1px; border-right-width:1px; border-bottom-width:1px; border-left-width:1px; border-top-style:solid; border-right-style:solid; border-bottom-style:solid; border-left-style:solid; border-top-color:rgb(204,204,204); border-right-color:rgb(204,204,204); border-bottom-color:rgb(204,204,204); border-left-color:rgb(204,204,204); color:rgb(0,112,0); font-family:monospace; background-color:rgb(250,250,250); margin-top:0px; margin-bottom:1em; margin-left:1em; overflow-x:auto; overflow-y:auto"><code style="line-height:1em; color:rgb(0,112,0); font-family:monospace"><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">void</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solve</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Executor</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">,</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Collection</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">throws</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">InterruptedException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">CompletionService</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutorCompletionService</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">e</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">size</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">List</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">></span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">new</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ArrayList</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">>(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">try</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Callable</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> s </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> solvers</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">add</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">submit</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">s</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">));</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">int</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,102,102)"><span class="lit" style="line-height:23px; color:rgb(0,102,102)">0</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> i </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)"><</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> n</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">++</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">i</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">try</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Result</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ecs</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">take</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">().</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">get</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">();</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">r </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> r</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">break</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">;</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span></code><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">catch</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">ExecutionException</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> ignore</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">finally</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">{</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">for</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(102,0,102)"><span class="typ" style="line-height:23px; color:rgb(102,0,102)">Future</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> f </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">:</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> futures</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> f</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">.</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">cancel</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">true</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">if</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">result </span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">!=</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">null</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">)</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"> </span></span><span style="line-height:23px; color:rgb(0,0,136)"><span class="kwd" style="line-height:23px; color:rgb(0,0,136)">use</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">(</span></span><span style="line-height:23px; color:rgb(0,0,0)"><span class="pln" style="line-height:23px; color:rgb(0,0,0)">result</span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">);</span></span><span style="line-height:23px; color:rgb(0,0,0)"><br style="line-height:23px"><span class="pln" style="line-height:23px; color:rgb(0,0,0)"></span></span><span style="line-height:23px; color:rgb(102,102,0)"><span class="pun" style="line-height:23px; color:rgb(102,102,0)">}}</span></span></pre> <span style="line-height:25px"><wbr style="line-height:25px">主要构造函数</wbr></span><br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">ExecutorCompletionService</span>(Executorexecutor)<wbr style="line-height:25px"><br style="line-height:25px"> 使用为执行基本任务而提供的执行程序创建一个ExecutorCompletionService，并将LinkedBlockingQueue作为完成队列。<br style="line-height:25px"> 参数：<br style="line-height:25px"> executor-要使用的执行程序<br style="line-height:25px"> 抛出：<br style="line-height:25px"> NullPointerException-如果执行程序为null<br style="line-height:25px"><wbr style="line-height:25px"><span style="color:#993300; line-height:25px">public</span><span style="color:#ff6600; line-height:25px">ExecutorCompletionService</span>(Executorexecutor,BlockingQueue<Future<V>>completionQueue)<wbr style="line-height:25px"><br style="line-height:25px"> 使用为执行基本任务而提供的执行程序创建一个ExecutorCompletionService，并将所提供的队列作为其完成队列。<br style="line-height:25px"> 参数：<br style="line-height:25px"> executor-要使用的执行程序<br style="line-height:25px"> completionQueue-用作完成队列的队列，通常是专供此服务使用的队列<br style="line-height:25px"> 抛出：<br style="line-height:25px"> NullPointerException-如果执行程序或completionQueue为null <div style="line-height:25px"> <span style="line-height:25px">主要成员函数</span><br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">submit</span><wbr style="line-height:25px">(Callable<V>task)<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 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。在完成时，可能会提取或轮询此任务。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的submit<br style="line-height:25px"> 参数：<br style="line-height:25px"> task-要提交的任务<br style="line-height:25px"> 返回：<br style="line-height:25px"> 一个表示挂起的任务完成的Future<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><span style="color:#ff6600; line-height:25px"><wbr style="line-height:25px">submit</wbr></span><wbr style="line-height:25px">(Runnabletask,Vresult)<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 提交要执行的Runnable任务，并返回一个表示任务完成的Future，可以提取或轮询此任务。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的submit<br style="line-height:25px"> 参数：<br style="line-height:25px"> task-要提交的任务<br style="line-height:25px"> result-要返回的已成功完成任务的结果<br style="line-height:25px"> 返回：<br style="line-height:25px"> 一个表示挂起的任务完成的Future，其get()方法将返回完成时给出的结果值<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">take()</span><wbr style="line-height:25px"><br style="line-height:25px"> throwsInterruptedException<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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，则等待。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的take<br style="line-height:25px"> 返回：<br style="line-height:25px"> 表示下一个已完成任务的Future<br style="line-height:25px"> 抛出：<br style="line-height:25px"> InterruptedException-如果在等待时被中断<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="color:#ff6600; line-height:25px">poll()</span><wbr style="line-height:25px"><br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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null。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的poll<br style="line-height:25px"> 返回：<br style="line-height:25px"> 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null<br style="line-height:25px"><span style="color:#993300; line-height:25px">public</span>Future<V><wbr style="line-height:25px"><span style="line-height:25px"></span><span style="color:#ff6600; line-height:25px">poll</span><wbr style="line-height:25px">(longtimeout,<br style="line-height:25px"> TimeUnitunit)<br style="line-height:25px"> throwsInterruptedException<br style="line-height:25px"> 从接口CompletionService复制的描述<br style="line-height:25px"> 获取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）。<br style="line-height:25px"> 指定者：<br style="line-height:25px"> 接口CompletionService<V>中的poll<br style="line-height:25px"> 参数：<br style="line-height:25px"> timeout-放弃之前需要等待的时间长度，以unit为时间单位<br style="line-height:25px"> unit-确定如何解释timeout参数的TimeUnit<br style="line-height:25px"> 返回：<br style="line-height:25px"> 表示下一个已完成任务的Future；如果等待了指定时间仍然不存在这样的任务，则返回null<br style="line-height:25px"> 抛出：<br style="line-height:25px"> InterruptedException-如果在等待时被中断</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> </div> </wbr></wbr></wbr></wbr></wbr></wbr>
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