java.util.concurrent 概览

骑猪看日落 2022-07-15 11:53 150阅读 0赞

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     <span style="white-space:nowrap; padding:5px 12px 7px; display:inline-block; float:left; background-color:rgb(248,152,29); border:none; height:16px">Interface Summary</span>  
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       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; white-space:nowrap; font-size:13px"> Interface</th> 
       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; font-size:13px"> Description</th> 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingDeque.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">BlockingDeque</a>&lt;E&gt;</td> 
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          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Deque.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Deque</code></a>&nbsp;that additionally supports blocking operations that wait for the deque to become non-empty when retrieving an element, and wait for space to become available in the deque when storing an element. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">BlockingQueue</a>&lt;E&gt;</td> 
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          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Queue.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Queue</code></a>&nbsp;that additionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become available in the queue when storing an element. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Callable.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Callable</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
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          A task that returns a result and may throw an exception. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.AsynchronousCompletionTask.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CompletableFuture.AsynchronousCompletionTask</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A marker interface identifying asynchronous tasks produced by&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">async</code>methods. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CompletionService</a>&lt;V&gt;</td> 
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          A service that decouples the production of new asynchronous tasks from the consumption of the results of completed tasks. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CompletionStage</a>&lt;T&gt;</td> 
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          A stage of a possibly asynchronous computation, that performs an action or computes a value when another CompletionStage completes. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentMap</a>&lt;K,V&gt;</td> 
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          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Map</code></a>&nbsp;providing thread safety and atomicity guarantees. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentNavigableMap.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentNavigableMap</a>&lt;K,V&gt;</td> 
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          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ConcurrentMap</code></a>&nbsp;supporting&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/NavigableMap.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">NavigableMap</code></a>&nbsp;operations, and recursively so for its navigable sub-maps. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Delayed.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Delayed</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A mix-in style interface for marking objects that should be acted upon after a given delay. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Executor</a></td> 
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          An object that executes submitted&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html" title="interface in java.lang" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Runnable</code></a>&nbsp;tasks. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ExecutorService</a></td> 
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          An&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Executor</code></a>&nbsp;that provides methods to manage termination and methods that can produce a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Future</code></a>for tracking progress of one or more asynchronous tasks. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.ForkJoinWorkerThreadFactory.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ForkJoinPool.ForkJoinWorkerThreadFactory</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Factory for creating new&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinWorkerThread.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinWorkerThread</code></a>s. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.ManagedBlocker.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ForkJoinPool.ManagedBlocker</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Interface for extending managed parallelism for tasks running in&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinPool</code></a>s. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Future</a>&lt;V&gt;</td> 
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          A&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Future</code>&nbsp;represents the result of an asynchronous computation. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RejectedExecutionHandler.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RejectedExecutionHandler</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A handler for tasks that cannot be executed by a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ThreadPoolExecutor</code></a>. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RunnableFuture.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RunnableFuture</a>&lt;V&gt;</td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Future</code></a>&nbsp;that is&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html" title="interface in java.lang" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Runnable</code></a>. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RunnableScheduledFuture.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RunnableScheduledFuture</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
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          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledFuture.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ScheduledFuture</code></a>&nbsp;that is&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html" title="interface in java.lang" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Runnable</code></a>. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ScheduledExecutorService</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ExecutorService</code></a>&nbsp;that can schedule commands to run after a given delay, or to execute periodically. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledFuture.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ScheduledFuture</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A delayed result-bearing action that can be cancelled. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadFactory.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadFactory</a></td> 
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          An object that creates new threads on demand. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:365px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">TransferQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">BlockingQueue</code></a>&nbsp;in which producers may wait for consumers to receive elements. 
        </div> </td> 
      </tr> 
     </tbody> 
    </table>
 *  <table style="width:603px; border-left:1px solid rgb(238,238,238); border-right:1px solid rgb(238,238,238); border-bottom:1px solid rgb(238,238,238)">  
     <span style="white-space:nowrap; padding:5px 12px 7px; display:inline-block; float:left; background-color:rgb(248,152,29); border:none; height:16px">Class Summary</span>  
     <tbody> 
      <tr> 
       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; white-space:nowrap; font-size:13px"> Class</th> 
       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; font-size:13px"> Description</th> 
      </tr> 
     </tbody> 
     <tbody> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/AbstractExecutorService.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">AbstractExecutorService</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Provides default implementations of&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ExecutorService</code></a>&nbsp;execution methods. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ArrayBlockingQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A bounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking queue</a>&nbsp;backed by an array. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CompletableFuture</a>&lt;T&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Future</code></a>&nbsp;that may be explicitly completed (setting its value and status), and may be used as a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">CompletionStage</code></a>, supporting dependent functions and actions that trigger upon its completion. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentHashMap</a>&lt;K,V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A hash table supporting full concurrency of retrievals and high expected concurrency for updates. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.KeySetView.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentHashMap.KeySetView</a>&lt;K,V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A view of a ConcurrentHashMap as a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Set</code></a>&nbsp;of keys, in which additions may optionally be enabled by mapping to a common value. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentLinkedDeque</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An unbounded concurrent&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Deque.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">deque</a>based on linked nodes. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentLinkedQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An unbounded thread-safe&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Queue.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">queue</a>based on linked nodes. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentSkipListMap</a>&lt;K,V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A scalable concurrent&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentNavigableMap.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ConcurrentNavigableMap</code></a>implementation. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ConcurrentSkipListSet</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A scalable concurrent&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/NavigableSet.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">NavigableSet</code></a>implementation based on a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ConcurrentSkipListMap</code></a>. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CopyOnWriteArrayList</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A thread-safe variant of&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html" title="class in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ArrayList</code></a>&nbsp;in which all mutative operations ( 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">add</code>,&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">set</code>, and so on) are implemented by making a fresh copy of the underlying array. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CopyOnWriteArraySet</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html" title="interface in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Set</code></a>&nbsp;that uses an internal&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">CopyOnWriteArrayList</code></a>&nbsp;for all of its operations. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CountDownLatch.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CountDownLatch</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CountedCompleter.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CountedCompleter</a>&lt;T&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinTask</code></a>&nbsp;with a completion action performed when triggered and there are no remaining pending actions. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CyclicBarrier.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CyclicBarrier</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/DelayQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">DelayQueue</a>&lt;E extends&nbsp;<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Delayed.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Delayed</a>&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An unbounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking queue</a>&nbsp;of 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Delayed</code>&nbsp;elements, in which an element can only be taken when its delay has expired. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Exchanger.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Exchanger</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A synchronization point at which threads can pair and swap elements within pairs. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorCompletionService.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ExecutorCompletionService</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">CompletionService</code></a>&nbsp;that uses a supplied&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Executor</code></a>&nbsp;to execute tasks. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executors.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Executors</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Factory and utility methods for&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Executor</code></a>,&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ExecutorService</code></a>,&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ScheduledExecutorService</code></a>,&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadFactory.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ThreadFactory</code></a>, and&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Callable.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Callable</code></a>&nbsp;classes defined in this package. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ForkJoinPool</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ExecutorService</code></a>&nbsp;for running&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinTask</code></a>s. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ForkJoinTask</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Abstract base class for tasks that run within a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinPool</code></a>. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinWorkerThread.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ForkJoinWorkerThread</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A thread managed by a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinPool</code></a>, which executes&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinTask</code></a>s. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/FutureTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">FutureTask</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A cancellable asynchronous computation. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">LinkedBlockingDeque</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An optionally-bounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingDeque.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking deque</a>&nbsp;based on linked nodes. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">LinkedBlockingQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An optionally-bounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking queue</a>&nbsp;based on linked nodes. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedTransferQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">LinkedTransferQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An unbounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">TransferQueue</code></a>&nbsp;based on linked nodes. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Phaser.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Phaser</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A reusable synchronization barrier, similar in functionality to 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CyclicBarrier.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">CyclicBarrier</code></a>&nbsp;and&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CountDownLatch.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">CountDownLatch</code></a>but supporting more flexible usage. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">PriorityBlockingQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An unbounded&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking queue</a>&nbsp;that uses the same ordering rules as class&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/PriorityQueue.html" title="class in java.util" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">PriorityQueue</code></a>&nbsp;and supplies blocking retrieval operations. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RecursiveAction.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RecursiveAction</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A recursive resultless&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinTask</code></a>. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RecursiveTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RecursiveTask</a>&lt;V&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A recursive result-bearing&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ForkJoinTask</code></a>. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ScheduledThreadPoolExecutor</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ThreadPoolExecutor</code></a>&nbsp;that can additionally schedule commands to run after a given delay, or to execute periodically. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Semaphore.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">Semaphore</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A counting semaphore. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/SynchronousQueue.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">SynchronousQueue</a>&lt;E&gt;</td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow">blocking queue</a>&nbsp;in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadLocalRandom.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadLocalRandom</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A random number generator isolated to the current thread. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadPoolExecutor</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          An&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">ExecutorService</code></a>&nbsp;that executes each submitted task using one of possibly several pooled threads, normally configured using&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executors.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Executors</code></a>factory methods. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.AbortPolicy.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadPoolExecutor.AbortPolicy</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A handler for rejected tasks that throws a 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">RejectedExecutionException</code>. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.CallerRunsPolicy.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadPoolExecutor.CallerRunsPolicy</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A handler for rejected tasks that runs the rejected task directly in the calling thread of the&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">execute</code>&nbsp;method, unless the executor has been shut down, in which case the task is discarded. 
        </div> </td> 
      </tr> 
      <tr> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.DiscardOldestPolicy.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadPoolExecutor.DiscardOldestPolicy</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A handler for rejected tasks that discards the oldest unhandled request and then retries&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">execute</code>, unless the executor is shut down, in which case the task is discarded. 
        </div> </td> 
      </tr> 
      <tr style="background-color:rgb(238,238,239)"> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:298px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.DiscardPolicy.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ThreadPoolExecutor.DiscardPolicy</a></td> 
       <td style="padding:8px 0px 3px 10px; vertical-align:top; font-size:13px"> 
        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          A handler for rejected tasks that silently discards the rejected task. 
        </div> </td> 
      </tr> 
     </tbody> 
    </table>
 *  <table style="width:603px; border-left:1px solid rgb(238,238,238); border-right:1px solid rgb(238,238,238); border-bottom:1px solid rgb(238,238,238)">  
     <span style="white-space:nowrap; padding:5px 12px 7px; display:inline-block; float:left; background-color:rgb(248,152,29); border:none; height:16px">Enum Summary</span>  
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       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; white-space:nowrap; font-size:13px"> Enum</th> 
       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; font-size:13px"> Description</th> 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:140px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">TimeUnit</a></td> 
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          A&nbsp; 
         <code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">TimeUnit</code>&nbsp;represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units. 
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 *  <table style="width:603px; border-left:1px solid rgb(238,238,238); border-right:1px solid rgb(238,238,238); border-bottom:1px solid rgb(238,238,238)">  
     <span style="white-space:nowrap; padding:5px 12px 7px; display:inline-block; float:left; background-color:rgb(248,152,29); border:none; height:16px">Exception Summary</span>  
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       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; white-space:nowrap; font-size:13px"> Exception</th> 
       <th style="vertical-align:top; padding:8px 3px 3px 7px; background:rgb(222,227,233); text-align:left; font-size:13px"> Description</th> 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BrokenBarrierException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">BrokenBarrierException</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Exception thrown when a thread tries to wait upon a barrier that is in a broken state, or which enters the broken state while the thread is waiting. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CancellationException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CancellationException</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Exception indicating that the result of a value-producing task, such as a&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/FutureTask.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">FutureTask</code></a>, cannot be retrieved because the task was cancelled. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">CompletionException</a></td> 
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          Exception thrown when an error or other exception is encountered in the course of completing a result or task. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">ExecutionException</a></td> 
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          Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/RejectedExecutionException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">RejectedExecutionException</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Exception thrown by an&nbsp; 
         <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html" title="interface in java.util.concurrent" style="color:rgb(74,103,130); padding-bottom:3px; font-weight:bold" rel="nofollow"><code style="font-family:&quot;DejaVu Sans Mono&quot;,monospace; padding-top:4px; margin-top:8px; line-height:1.4em">Executor</code></a>&nbsp;when a task cannot be accepted for execution. 
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       <td style="padding:8px 0px 3px 10px; vertical-align:top; white-space:nowrap; font-size:13px; width:208px"> <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeoutException.html" title="class in java.util.concurrent" style="color:rgb(74,103,130); font-weight:bold" rel="nofollow">TimeoutException</a></td> 
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        <div style="margin:3px 10px 2px 0px; color:rgb(71,71,71); font-size:14px; font-family:&quot;DejaVu Serif&quot;,Georgia,&quot;Times New Roman&quot;,Times,serif; padding-top:0px">
          Exception thrown when a blocking operation times out. 
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