Block the worker thread and wait for the response.
阻塞工作线程并等待响应。
The synchronized keyword lets only one thread enter a code block at a time.
synchronized关键字每次仅允许一个线程进入代码块。
Using the Future object, the current thread can block to wait for the result
利用Future对象，当前线程可阻塞来等待结果
The synchronized statement enbales only one thread to enter a code block at a time.
同步语句一次仅允许一个线程进入代码块。
The second point is that there is no such thing as "thread in a block".
第二点是没有所谓的“线程在一块”。
Whenever a thread enters into a dry block.
每当螺纹进入干燥块时。
Whenever a thread enters into a dry block.
每当螺纹进入干燥块时。
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