阻塞直到所有任务执行完毕。当任意以下情况出现则停止阻塞，以先发生为准：收到关闭请求、超时、线程中断。

Blocks until all tasks have completed execution after a shutdown request, or the timeout occurs, or the current thread is interrupted, whichever happens first.

youdao

他汇报说他的任务已执行完毕。

He reported that his task had been fulfilled.

youdao

他汇报说他的任务已执行完毕。

He reported that his task had been fulfilled.

youdao