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修改keepAliveTime参数详解

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销毁并不只针对核心线程，会对核心线程和非核心线程一视同仁。 参见《Java 性能调优实战》
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docs/java/concurrent/java-concurrent-questions-03.md
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@ -308,7 +308,7 @@ public ScheduledThreadPoolExecutor(int corePoolSize) {
`ThreadPoolExecutor`其他常见参数 :
- **`keepAliveTime`**:线程池中的线程数量大于 `corePoolSize` 的时候，如果这时没有新的任务提交，核心线程外的线程不会立即销毁，而是会等待，直到等待的时间超过了 `keepAliveTime`才会被回收销毁；
- **`keepAliveTime`**:线程池中的线程数量大于 `corePoolSize` 的时候，如果这时没有新的任务提交，多余的空闲线程不会立即销毁，而是会等待，直到等待的时间超过了 `keepAliveTime`才会被回收销毁，线程池回收线程时，会对核心线程和非核心线程一视同仁，直到线程池中线程的数量等于 `corePoolSize` ，回收过程才会停止。
- **`unit`** : `keepAliveTime` 参数的时间单位。
- **`threadFactory`** :executor 创建新线程的时候会用到。
- **`handler`** :饱和策略。关于饱和策略下面单独介绍一下。
@ -955,4 +955,4 @@ public int await() throws InterruptedException, BrokenBarrierException {
- Java 并发之 AQS 详解：https://www.cnblogs.com/waterystone/p/4920797.html
- Java 并发包基石-AQS 详解：https://www.cnblogs.com/chengxiao/archive/2017/07/24/7141160.html
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