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内部通过阻塞队列+FutureTask，
````java
// 创建线程池
ExecutorService pool = Executors.newFixedThreadPool(POOL_SIZE);
CompletionService< Integer > cService = new ExecutorCompletionService< >(pool);
// 向里面扔任务
for (int i = 0; i < TOTAL_TASK ; i + + ) {
/ / 这 边 不 是 直 接 通 过 线 程 池 来 提 交 任 务 ， 而 是 通 过 CompletionService 来 提 交
cService . submit ( new WorkTask ( " ExecTask " + i ) ) ;
}
/ / 检 查 线 程 池 任 务 执 行 结 果
for ( int i = 0; i < TOTAL_TASK ; i + + ) {
/ / 同 样 也 是 从 CompletionService 来 取 出 结 果 ， 因 为 CompletionService 内 部 实 现 通 过 一 个 BlockingQueue 来 保 存 已 经 完 成 的 结 果 。
int sleptTime = cService.take().get();
System . out . println ( " slept " + sleptTime + " ms . . . " ) ;
count . addAndGet ( sleptTime ) ;
}
` ` ` `
