标签：foo logs out ring 定义 nts 引用 ace java
策略模式定义了一系列的算法，并将每一个算法封装起来，而且使它们可以相互替换，让算法独立于使用它的客户而独立变化，具体应用场景如第三方支付对接不同银行的算法。
要点：1）抽象策略角色
2）具体策略角色：包装相关算法和行为
3）环境角色：持有一个策略类的引用，最终给客户端调用
1、抽象策略接口
public interface SwimmingStratege { public void swimming(); }
2、具体策略角色SwimmingWithFoot
public class SwimmingWithFoot implements SwimmingStratege { public void swimming() { System.out.println("我借助脚滑动在水中游走"); } }
3、具体策略角色SwimmingWithWind
public class SwimmingWithWind implements SwimmingStratege { public void swimming() { System.out.println("我借助风在水中游走"); } }
4、环境角色Duck 抽象类
public abstract class Duck { public void quack() { System.out.println("嘎嘎嘎"); } public abstract void display(); private SwimmingStratege swimmingStratege; public void setSwimmingStratege(SwimmingStratege swimmingStratege) { this.swimmingStratege = swimmingStratege; } public void swimming() { swimmingStratege.swimming(); } }
5、环境角色RealDuck
public class RealDuck extends Duck { public RealDuck() { super(); super.setSwimmingStratege(new SwimmingWithFoot()); } @Override public void quack() { super.quack(); } public void display() { System.out.println("我是真的鸭子"); } }
6、环境角色
public class YellowDuck extends Duck { public YellowDuck() { super(); super.setSwimmingStratege(new SwimmingWithWind()); } @Override public void quack() { super.quack(); } public void display() { System.out.println("我是大黄鸭"); } }
7、测试
public class Model { public static void main(String[] args) { Duck duck = new RealDuck(); // Duck duck = new YellowDuck(); duck.display(); duck.quack(); duck.swimming(); } }
标签：foo logs out ring 定义 nts 引用 ace java
原文地址：http://www.cnblogs.com/sunjf/p/stratege.html
