《軟件設計模式》課程實驗報告-實驗12-觀察者模式-學號姓名-副本

1、幼而福州理工學浣FUZHOU INSTITUTE OF TECHNOLOGY課程名稱專業(yè)班級姓名學號指導老師日期福州理工學院工學院二。一七年三月實驗12 觀察者模式的應用、實驗目的1 .理解觀察者模式的定義2 .掌握觀察者模式的結構類圖和典型代碼、實驗準備與環(huán)境1.實驗準備觀察者模式類圖Sufcjecl+ update i;abs updtef):+ attach (Observer ote)+ detacti (Observer cbs) 4. notify 0fcr(ob5-Ot»sarrersiObserverConcrete Subject-subjectStete :+ g

2、diState (+ setstate。-$ub)eeiGgrreteOtxrver cbsen/er State :return 莒ubjmHS怕怕obs e n erState=$ubjec t.getsiatej;2.實驗環(huán)境StarUML (或 Visio)+Eclipse三、實驗要求某在線游戲支持多人聯(lián)機對戰(zhàn)，每個玩家都可以加入某一戰(zhàn)隊組成聯(lián)盟，當戰(zhàn)隊中某一成員受到敵人攻擊時將給所有盟友發(fā)送通知，盟友收到通知后將作出響應。使用觀察者模式設計并實現(xiàn)該過程。繪制類圖并編程實現(xiàn)。四、實驗步驟package com.test.observer;觀察者接口，由觀察者來實現(xiàn)public inte

3、rface Observer public String getName();public void setName(String name);public void help();聲明支援方法public void beAttacked(Subject sub); 聲明遭受攻擊方式package com.test.observer;public interface Subject public void join(Observer o);public void quit(Observer o);public void notifyObservers(String name);package

4、com.test.observer;import java.util.ArrayList;public class ConcreteSubject implements Subject private String teamName ;戰(zhàn)隊名稱 private ArrayList<Observer> observers，觀察者集合/創(chuàng)建戰(zhàn)隊public ConcreteSubject(String teamName) System.out.println(teamName+ "戰(zhàn)隊組建成功！")； System.out.println( "="

5、;);observers =new ArrayList<Observer>();this .teamName =teamName;public String getTeamName() return teamName ;public void setTeamName(String teamName) this .teamName = teamName;添加隊友Overridepublic void join(Observer o) System.out.println(o.getName()+ "加入"+this .teamName +"戰(zhàn)隊!&quo

6、t;); observers .add(o);注銷觀察者Overridepublic void quit(Observer o) System.out.println(o.getName()+ "退出"+this .teamName +"戰(zhàn)隊!"); observers .remove(o);Overridepublic void notifyObservers(String name) );System.err.println( this .teamName +"戰(zhàn)隊消息：隊友"+name+"正在求救!for (Objec

7、t obs:observers) if(!(Observer)obs).getName().equalsIgnoreCase(name) (Observer)obs).help();package com.kuang.observer.improve;import com.kuang.observer.CurrentConditions;import java.util.ArrayList;public class WeatherData implements Subject溫度氣壓濕度privatefloattemperature;privatefloatpressure;privatefl

8、oathumidity ;觀察者集合private ArrayList<Observer> observers;public WeatherData() observers =new ArrayList<Observer>();public float getTemperature() return temperature ;public float getPressure() return pressure ;public float getHumidity() return humidity ;public void dataChange() notifyObser

9、vers();當數(shù)據(jù)有更新時，就調用setDatapublic void setDatafloat temperature, float pressure, float humidity) this .temperature = temperature;this .pressure = pressure;this .humidity = humidity; dataChange();注冊一個觀察者Overridepublic void registerObserver(Observer o) observers .add(o);移除一個觀察者Overridepublic void remove

10、Observer(Observer o) if (observers .contains(o) observers .remove(o);public class Client 遍歷所有的觀察者，并Overridepublic void notifyObservers() for (int i = 0; i < observers .size(); i+) observers .get(i).update(this.temperature ,this .pressure ,this .humidity );package com.test.observer;public class Pl

11、ayer implements Observer private String name;public Player(String name) this .name=name;Overridepublic String getName() return this .name;Overridepublic void setName(String name) this .name=name;Overridepublic void help() System.out.println( this .name + "正在路上，猥瑣發(fā)育 ")； Overridepublic void

12、beAttacked(Subject sub) System.out.println( this .name + "救救我！");sub.notifyObservers( name);package com.test.observer;public static void main(String口 args) / TODO Auto-generated method stub定義觀察目標對象Subject s1;s1=new ConcreteSubject("GPL");定義5英雄Observer player1,player2,player3,play

13、er4,player5;player1 = new Player("亞瑟");s1.join(player1);player2= new Player("盤古");s1.join(player2);player3= new Player("后羿");s1.join(player3);player4= new Player("王昭君");s1.join(player4);player5= new Player("百里玄策");s1.join(player5);player1.beAttacked(s1);五、討論與分析觀察者模式的主要的作用就是