问题描述
当线程完成时，您不能再使用start（）方法运行它：它会抛出异常。有人可以解释，为什么？这样的架构决定背后有什么？
When a Thread is finished, you cannot run it once more, using start() method: it throws an Exception. Could anyone explain, why? What stands behind such an architectural decision?
推荐答案
因为在一个单独的线程中执行代码的方法是不创建一个线程，它链接到什么是线程的系统视图（有关绿色和系统线程之间的区别的无尽细节），但是创建一个，并由Thread执行。
Because the way to have code executed in a separate thread is not to create a thread, which is linked to system view of what is a thread (there are endless details on distinction between green and system threads), but to create a Runnable, and have it executed by a Thread.
为了获得最佳代码（由于线程的创建是耗时的），甚至建议您不要直接让您的Runnable由线程执行，而是由 ExecutorService ，这将允许你可以使用线程池，而不用担心所有这些细节。
For optimal code (since creation of threads is time-consuming), I would even recommand you not to directly have your Runnable executed by a thread, but rather by an ExecutorService, which will allow you to use a thread pool without bothering about all those details.
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