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Dec 15, 2020
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Update java线程池学习总结.md #1027

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2 changes: 1 addition & 1 deletion docs/java/multi-thread/java线程池学习总结.md
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Expand Up @@ -543,7 +543,7 @@ public interface Callable<V> {
#### 4.3.2 `execute()` vs `submit()`

1. **`execute()`方法用于提交不需要返回值的任务，所以无法判断任务是否被线程池执行成功与否；**
2. **`submit()`方法用于提交需要返回值的任务。线程池会返回一个 `Future` 类型的对象，通过这个 `Future` 对象可以判断任务是否执行成功**，并且可以通过 `Future` 的 `get()`方法来获取返回值，`get()`方法会阻塞当前线程直到任务完成，而使用 `get（long timeout，TimeUnit unit）`方法则会阻塞当前线程一段时间后立即返回，这时候有可能任务没有执行完。
2. **`submit()`方法用于提交需要返回值的任务。线程池会返回一个 `Future` 类型的对象，通过这个 `Future` 对象可以判断任务是否执行成功** ，并且可以通过 `Future` 的 `get()`方法来获取返回值，`get()`方法会阻塞当前线程直到任务完成，而使用 `get（long timeout，TimeUnit unit）`方法则会阻塞当前线程一段时间后立即返回，这时候有可能任务没有执行完。

我们以**`AbstractExecutorService`**接口中的一个 `submit` 方法为例子来看看源代码：

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