设计模式-Java中自带的观察者模式（Observer）

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由于代码比较简单，我们直接看代码：

class MySubject extends Observable{@Overridepublic synchronized void addObserver(Observer o) {// TODO Auto-generated method stubsuper.addObserver(o);}@Overridepublic void notifyObservers() {// TODO Auto-generated method stubsuper.notifyObservers();}@Overrideprotected synchronized void setChanged() {// TODO Auto-generated method stubsuper.setChanged();}}

class MyObserver implements Observer{@Overridepublic void update(Observable o, Object arg) {// TODO Auto-generated method stubSystem.out.println("I'am updated!");}}

package cn.sehzh;import java.util.Observable;import java.util.Observer;class Main {public static void main(String[] args) {MyObserver myObserver;MySubject mySubject;myObserver = new MyObserver();mySubject = new MySubject();mySubject.addObserver(myObserver);mySubject.setChanged();mySubject.notifyObservers();}}

输出结果：

I'am update!

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