The code inside the loop (pump the Thread.sleep ) keeps the service running and listening for messages.

循环中的代码(pump 、Thread. sleep)使服务一直运行，并侦听消息。

youdao

With applied and simplified structure and self loop mill, this machine needs no pump.

结构实用、简洁，自循环研磨，无须泵浦。

youdao

With applied and simplified structure and self loop mill, this machine needs no pump.

结构实用、简洁，自循环研磨，无须泵浦。

youdao