用Java实现图书馆座位预定系统，有服务器端和客户端，用户在客户端通过界面操作预定座位，服务器端将用户ID、预定的座位号和预定时间段等信息存入数据库中。预定时间到后，服务器自动将预定的座位信息清空。(Using Java to realize library seat reservation system, there are server side and client side. Users can schedule bookings through the interface on the client side, and the server will store user ID, predetermined seat number and predetermined time segment information into database. After the scheduled time, the server automatically empties the reserved seat information.)