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Executor 接口执行已提交的 Runnable 任务的对象。此接口提供一种将任务提交与每个任务将如何运行的机制（包括线程使用的细节、调度等）分离开来的方法。通常使用 Executor 而不是显式地创建线程。例如，可能会使用以下方法，而不是为一组任务中的每个任务调用 new Thread(ne...

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