[原创]设计模型探索C3-Observer parttern 之饲机而动

[原创]设计模型探索C3-Observer parttern 之饲机而动

观察者JDK实现:
1.主题

package  observer.jdk;

import  java.util.Observable;

public   class  SubjectImpl  extends  Observable
{   
    public void notifying()
    {
        this.setChanged();
        this.notifyObservers("重要通知");
    }
}

2.观察者

package  observer.jdk;

import  java.util.Observable;
import  java.util.Observer;

public   class  ObserverImpl  implements  Observer
{   
    private String name;
    
    public ObserverImpl(String name)
    {
        this.name = name;
    }

    public void update(Observable o, Object arg)
    {
        System.out.println(this.name + "观察者收到:\"" + arg + "\"");
    }
}

3.测试类

package  observer.jdk;


public   class  Test
{   
    public static void main(String[] args)
    {
        SubjectImpl subject = new SubjectImpl();
        
        subject.addObserver(new ObserverImpl("小赵"));
        subject.addObserver(new ObserverImpl("小钱"));
        subject.addObserver(new ObserverImpl("小孙"));
        subject.addObserver(new ObserverImpl("小李"));
        
        subject.notifying();
        
    }
}