用java写的GUI Analog Clock,用上了Observer,可以更改时间，对学习observer的运用很有帮助！-with java write GUI Analog Clock, with the use of the Observer. can change the time, to learn the use of observer helpful!

用java写的GUI Analog Clock,用上了Observer,可以更改时间，对学习observer的运用很有帮助！-with java write GUI Analog Clock, with the use of the Observer. can change the time, to learn the use of observer helpful!