The recipient can ask the Future to block until a result is ready, poll to see whether it's complete, cancel the computation, or check whether another thread has canceled it.
接收者可以要求Future阻止线程，直至一个结果就绪，检测查看它是否完成并取消计算指令，或检查是否有其他进程取消了它。
The recipient can ask the Future to block until a result is ready, poll to see whether it's complete, cancel the computation, or check whether another thread has canceled it.
接收者可以要求Future阻止线程，直至一个结果就绪，检测查看它是否完成并取消计算指令，或检查是否有其他进程取消了它。
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