如何用固定数目的工作线程实现简单线程

本文介绍了如何用固定数目的工作线程实现简单线程的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在寻找最简单，最直接的方法来实现以下操作：

I'm looking for the simplest, most straightforward way to implement the following:

• 主程序实例化worker
• 只需 n 个任务可以一次运行。
• 当到达 n 时，在运行线程的的计数回落到 n 。

• The main program instantiates worker threads to do a task.
• Only n tasks can be running at once.
• When n is reached, no more workers are started until the count of running threads drops back below n.

推荐答案

我认为 Executors.newFixedThreadPool 符合您的要求。有多种不同的方法来使用生成的ExecutorService，这取决于您是否希望将结果返回到主线程，或者任务是否完全自包含，以及是否有要执行的任务的集合，任务是否排队以响应某些事件。

I think that Executors.newFixedThreadPool fits your requirements. There are a number of different ways to use the resulting ExecutorService, depending on whether you want a result returned to the main thread, or whether the task is totally self-contained, and whether you have a collection of tasks to perform up front, or whether tasks are queued in response to some event.

Collection<YourTask> tasks = new ArrayList<YourTask>(); YourTask yt1 = new YourTask(); ... tasks.add(yt1); ... ExecutorService exec = Executors.newFixedThreadPool(5); List<Future<YourResultType>> results = exec.invokeAll(tasks);

或者，如果您有一个新的异步任务来响应某个事件，使用ExecutorService的简单 execute（Runnable）方法。

Alternatively, if you have a new asynchronous task to perform in response to some event, you probably just want to use the ExecutorService's simple execute(Runnable) method.