伍马

package Obseiver; public interface Subject { public void register(Obseivers o); public void delete(Obseivers o); public void notifyAllSubeject(); } package Obseiver; public interface Obseiver

package Strategy_Pattern; /* * head first 设计模式 完整代码练习 * * 1.策略模式（封装算法，让算法之间可以相互代替。） * * * */ public abstract class Strategy_Pattern_Duck { FlyBehaver flyBehaver; EatDifference eatDiffer