select方法调用一直受阻塞，直到一个或多个警卫就绪为止(请记住，所有竞争的警卫对于alternative类来说都是已知的)。

The select method call blocks until one or more guards are ready (remember that all contending guards are known to the Alternative class).

youdao

select方法调用一直受阻塞，直到一个或多个警卫就绪为止(请记住，所有竞争的警卫对于alternative类来说都是已知的)。

The select method call blocks until one or more guards are ready (remember that all contending guards are known to the Alternative class).

youdao