import java.util.Vector;
//观察者设计模式
public class ObserverClient
{public static void main(String[] args) {Subject sub=new Event();sub.attach(new observer1());sub.attach(new observer2());sub.doSomething();}
}
abstract class Subject
{Vector<Observer> vector=new Vector<Observer>();public void attach(Observer o){vector.add(o);}public void detach(Observer o){vector.remove(o);}public void notifyObserver(){for(Observer o : vector){o.update();}}public abstract void doSomething......
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