/**Java观察者模式的场景：一个女孩洗澡，被很多男孩偷看。女孩洞察后，搜索坏男孩，然后继续洗澡。三个类：Boy，Girl还有主类MainClass。*//*男孩Boy.java*/import java.util.Observable;import java.util.Observer;public class Boy implements Observer{ private String name=""; public Boy(String name){ this.name=name; } @Override public void update(Observable o, Object obj) {Girl girl=(Girl)o;System.out.println(name+" 看到 "+girl.getName()+" "+girl.getStatus()); }public String getName() { return name; }}/*女孩Girl.java*/import java.util.Observable;public class Girl extends Observable{ private String name=""; private String thing=""; public Girl(String name){ this.name=name; } public void doSomething(String thing){ this.thing=thing;this.setChanged();this.notifyObservers(thing); } public String getStatus(){ return thing; } public String getName(){ return name; }}/*主类，测试*/import java.util.ArrayList;import java.util.Random;public class MainClass { private Girl girl=null; private ArrayList<Boy> boys=new ArrayList<Boy>(); public MainClass() {girl=new Girl("MM");Boy boyA=new Boy("小A"); Boy boyB=new Boy("小B"); Boy boyC=new Boy("小C"); Boy boyD=new Boy("小D"); boys.add(boyA); boys.add(boyB); boys.add(boyC); boys.add(boyD);girl.addObserver(boyA); girl.addObserver(boyB); girl.addObserver(boyC); girl.addObserver(boyD);girl.doSomething("脱衣服…"); girl.doSomething("洗澡…"); girl.doSomething("感觉有人偷看！？停止洗澡，穿上衣服，开始搜查…"); girlSearchBadBoy();//搞定！继续洗澡 girl.doSomething("再次脱衣服…"); girl.doSomething("再次洗澡…"); } private void girlSearchBadBoy() { Random rand=new Random();int unluckyNumber=rand.nextInt( girl.countObservers() ); Boy unluckyBoy=boys.get(unluckyNumber);System.out.println(unluckyBoy.getName()+" 暴露，踢出去！"); girl.deleteObserver(unluckyBoy); }public static void main(String[] args) { new MainClass(); }}
，爱情不是避难所，想进去避难的话，是会被赶出来的。
