通过线程进行通信...火车站售票大厅有许多窗口,有些开放,有些不开放.顾客进去火车站售票大厅后,到某个售票窗口排队等候,排到了就办理业务,然后离去.-Communicate through the thread ... the railway station ticket hall has many windows, some open, some closed. Customers into the station ticket hall, the ticket window to a que