实验九+观察者模式、策略模式.doc

实验九淘宝店号5302131、 实验目的 1、熟练掌握观察值模式、策略模式的建模方式 2、掌握如何应用观察值模式、策略模式编程解决具体问题2、 实验器材 1、计算机一台 2、JCreator软件实验内容 1、以红绿灯为例，用观察值模式模拟实现现实生活中行人、车辆以及红绿灯之间的关系 2、设计一个网上书店，该系统中所有的计算机类图书（ComputerBook）每本都有10%的折扣，所有语言类图书（LanguageBook）每本都有2元的折扣，小说类图书（NovelBook）每100元有10 元的折扣。现使用策略模式来设计该系统，绘制类图并编程实现。3、 实验结果程序代码：（1） 观察者模式代码package com.zfs.pojo;public class Client public static void main(String args) TrafficLight road = new RoadLight();TrafficLight walk = new WalkerLight();TrafficObserve walker = new Walker();TrafficObserve vehicle = new Vehicle();road.attach(vehicle);walk.attach(walker);road.changeColor();walk.changeColor();System.out.println(-);road.changeColor();walk.changeColor();package com.zfs.pojo;import java.awt.Color;public class RoadLight extends TrafficLightpublic RoadLight() this.color = red;Overridepublic void changeColor() if(this.color.equals(red)this.color = green;elsethis.color = red;for(Object obs:observers)(TrafficObserve)obs).response(this.color);package com.zfs.pojo;import java.awt.Color;import java.util.ArrayList;public abstract class TrafficLight protected String color;protected ArrayList observers = new ArrayList();public abstract void changeColor();public void attach(TrafficObserve obs)observers.add(obs);public void remove(TrafficObserve obs)observers.remove(obs);package com.zfs.pojo;public interface TrafficObserve public void response(String color);package com.zfs.pojo;public class Vehicle implements TrafficObserveOverridepublic void response(String color) if(color.equals(red)System.out.println(车灯变红，车辆请等待);elseSystem.out.println(车灯变绿，车辆可以通行);package com.zfs.pojo;public class Walker implements TrafficObserve Overridepublic void response(String color) if(color.equals(red)System.out.println(行人灯变红，行人请等待);elseSystem.out.println(行人灯变绿，行人可以通行);package com.zfs.pojo;public class WalkerLight extends TrafficLightpublic WalkerLight() this.color=green;Overridepublic void changeColor() if(this.color.equals(red)this.color = green;elsethis.color = red;for(Object obs:observers)(TrafficObserve)obs).response(this.color);（2） 策略模式代码package com.zfs.StrategyPatten;import com.zfs.StrategyPatten.Strategy.Book;import com.zfs.StrategyPatten.Strategy.ComputerStrategy;import com.zfs.StrategyPatten.Strategy.LanguageStrategy;import com.zfs.StrategyPatten.Strategy.NovelStrategy;import com.zfs.StrategyPatten.Strategy.Strategy;public class Client public static void main(String args) Book b1,b2,b3;b1 = new Book(100);b2 = new Book(220);b3 = new Book(305);Book books = b1,b2,b3;ComputerStrategy cs = new ComputerStrategy();LanguageStrategy ls = new LanguageStrategy();NovelStrategy ns = new NovelStrategy();System.out.println(打折前总共的价格为： + 100 + 200 + 300);System.out.println(计算机书打折后的价格： + cs.calculate(books);System.out.println(语言书打折后的价格 + ls.calculate(books);System.out.println(小说书打折后的价格 + ns.calculate(books);package com.zfs.StrategyPatten;import com.zfs.StrategyPatten.Strategy.Book;import com.zfs.StrategyPatten.Strategy.Strategy;public class Context private Strategy strategyObj;public double RealNum(Book books) return strategyObj.calculate(books);package com.zfs.StrategyPatten.Strategy;public class Book public double num;public Book(int num)this.num = num;package com.zfs.StrategyPatten.Strategy;public class ComputerStrategy extends Strategy Overridepublic double calculate(Book ComputerBook) double AllNum = 0;for (int i = 0; i ComputerBook.length; i+) AllNum += ComputerBooki.num;return AllNum * 0.9;package com.zfs.StrategyPatten.Strategy;public class LanguageStrategy extends Strategy Overridepublic double calculate(Book LanguageBook) double AllNum = 0;for (int i = 0; i LanguageBook.length; i+) AllNum += (LanguageBooki.num - 2);return AllNum;package com.zfs.StrategyPatten.Strategy;public class NovelStrategy extends StrategyOverridepublic double calculate(Book NovelStrategy) double AllNum = 0;for (int i = 0; i NovelStrategy.length; i+) AllNum += package com.zfs.StrategyPatten.Strategy;public abstract class Strategy public abstract double calculate(Book num);package