不定长函参的Java观察者模式更新数据传递

不定长函参的Java观察者模式更新数据传递

 

import java.util.LinkedList;

/**
 * 抽象被观察者。
 * 
 * @param 
 */
public abstract class Subject {
    private LinkedList observers;

    public Subject() {
        observers = new LinkedList<>();
    }

    public Subject getSubject() {
        return this;
    }

    public void registerObserver(Observer observer) {
        observers.add(observer);
    }

    public void removeObserver(Observer observer) {
        observers.remove(observer);
    }

    public void notifyObserver(T... t) {
        for (Observer observer : observers) {
            observer.update(getSubject(), t);
        }
    }
}

 

/**
 * 抽象观察者。
 * @param 
 */
public interface Observer {
    void update(Subject subject, T... t);
}

---

public class State extends Subject {
    @Override
    public Subject getSubject() {
        return this;
    }
}

 

public class ObserverImpl implements Observer