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Merge pull request Snailclimb#1048 from langghaha/patch-1
[拼写错误] java线程池学习总结.md
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docs/java/multi-thread/java线程池学习总结.md

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@@ -834,7 +834,7 @@ Wed Nov 13 13:40:43 CST 2019::pool-1-thread-5
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**`ScheduledThreadPoolExecutor` 的执行主要分为两大部分:**
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1. 当调用 `ScheduledThreadPoolExecutor`**`scheduleAtFixedRate()`** 方法或者**`scheduleWirhFixedDelay()`** 方法时,会向 `ScheduledThreadPoolExecutor`**`DelayQueue`** 添加一个实现了 **`RunnableScheduledFuture`** 接口的 **`ScheduledFutureTask`**
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1. 当调用 `ScheduledThreadPoolExecutor`**`scheduleAtFixedRate()`** 方法或者 **`scheduleWithFixedDelay()`** 方法时,会向 `ScheduledThreadPoolExecutor`**`DelayQueue`** 添加一个实现了 **`RunnableScheduledFuture`** 接口的 **`ScheduledFutureTask`**
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2. 线程池中的线程从 `DelayQueue` 中获取 `ScheduledFutureTask`,然后执行任务。
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**`ScheduledThreadPoolExecutor` 为了实现周期性的执行任务,对 `ThreadPoolExecutor`做了如下修改:**

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