[原创]设计模型探索C2-Observer parttern之饲机而动

[原创]设计模型探索C2-Observer parttern之饲机而动

观察模式原生实现:
1.主题接口:

package  observer.natives;

public   interface  Subject
{   
    public void addObserver(Observer observer);
    
    public void notifying();
}

2.主题实现类:

package  observer.natives;

import  java.util.ArrayList;
import  java.util.List;

public   class  SubjectImpl  implements  Subject
{   
    private List<Observer> observerLst = new ArrayList<Observer>();
    
    public void addObserver(Observer observer)
    {
        observerLst.add(observer);
    }
    
    public void notifying()
    {
        for(Observer observer : observerLst)
        {
            observer.updateData();
        }
    }
    
}

3.观察者接口

package  observer.natives;

public   interface  Observer
{   
    public void updateData();
}

4.观察者实现类

package  observer.natives;

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

    public void updateData()
    {
        System.out.println(name + " 收到通知");
    }
}

5.测试类

package  observer.natives;

public   class  Test
{   
    public static void main(String[] args)
    {
        Subject 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();
        
    }
}