程序包 net.congyh.designpatterns.observer

接口概要

接口	说明
Observer	Created by congyihao on 16-11-2.

类概要

类	说明
Client	Created by congyihao on 16-11-2.
NewsPaper	Created by congyihao on 16-11-2.
Reader	Created by congyihao on 16-11-2.
Subject	Created by congyihao on 16-11-2.