Java Observer设计模式

package observer;
//接口，用以实现小孩醒来时要做的事
public interface IWakeupListener {

    public void ActionToWakeup(WakeupEvent eve);
}

package observer;
//Dad实现喂奶的动作
public class Dad  implements IWakeupListener{
    @Override
    public void ActionToWakeup(WakeupEvent e) {
        System.out.println("儿子醒了，我要去喂奶了。。。");
    }
}

package observer;
//狗实现叫的动作
public class Dog implements IWakeupListener {

    @Override
    public void ActionToWakeup(WakeupEvent e) {
        System.out.println("小主人醒了，我就汪汪叫。。。");
    }

}

package observer;
//爷爷实现抱的动作
public class GrandFather implements IWakeupListener{

    @Override
    public void ActionToWakeup(WakeupEvent e) {
        System.out.println("小孙子醒了，我要去抱抱！！！");
    }
}

package observer;
//小孩的醒来事件:醒来时间，醒来地点，醒来的是谁
public class WakeupEvent {
    private long time;
    private String location;
    private Child sorce;
    
    
    public WakeupEvent(long time, String location, Child sorce) {
        super();
        this.time = time;
        this.location = location;
        this.sorce = sorce;
    }
    public long getTime() {
        return time;
    }
    public void setTime(long time) {
        this.time = time;
    }
    public String getLocation() {
        return location;
    }
    public void setLocation(String location) {
        this.location = location;
    }
    public Child getSorce() {
        return sorce;
    }
    public void setSorce(Child sorce) {
        this.sorce = sorce;
    }
}

package observer;
//小孩
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Child implements Runnable{

    private List<IWakeupListener> listener = new ArrayList<IWakeupListener>();
    
    public void addWakeupListener(IWakeupListener l)
    {
        listener.add(l);
    }
    
//-------------测试
    @Override
    public void run() {
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        wakeup();
    }

    private void wakeup() {
//        Iterator<IWakeupListener> iter = listener.iterator();
//        while (iter.hasNext()) {
//            IWakeupListener l = iter.next();
//        }
        
        for(Iterator<IWakeupListener> iter = listener.iterator();iter.hasNext();)
        {
            IWakeupListener l = iter.next();
            l.ActionToWakeup(new WakeupEvent(System.currentTimeMillis(), "home", this));
        }
        
    }
//-------------测试end

}

配置文件：observer.properties，放在asset/config文件夹下
1 observers=observer.Dad;observer.GrandFather;observer.Dog

package observer;
//解析.properties
import java.io.IOException;
import java.util.Properties;

public class PropertyProxy {

    private Properties properties = new Properties();
    private static PropertyProxy instance=null;
    public static PropertyProxy Instance()
    {
        if(instance==null)
        {
            instance = new PropertyProxy();
        }
        return instance;
    }
    
    public String getProperty(String path,String key)
    {
        try {
            properties.load(PropertyProxy.class.getClassLoader().getResourceAsStream(path));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return properties.getProperty(key);
    }
}

package observer;

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

public class Child implements Runnable{

    private List<IWakeupListener> listener = new ArrayList<IWakeupListener>();
    
    public void addWakeupListener(IWakeupListener l)
    {
        listener.add(l);
    }
    
//-------------测试
    @Override
    public void run() {
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        wakeup();
    }

    private void wakeup() {
//        Iterator<IWakeupListener> iter = listener.iterator();
//        while (iter.hasNext()) {
//            IWakeupListener l = iter.next();
//        }
        
        for(Iterator<IWakeupListener> iter = listener.iterator();iter.hasNext();)
        {
            IWakeupListener l = iter.next();
            l.ActionToWakeup(new WakeupEvent(System.currentTimeMillis(), "home", this));
        }
        
    }
//-------------测试end

}

package observer;

import oracle.net.aso.c;

public class Test {

    public static void main(String[] args) {
        Child child = new Child();
        
        String[] observerArr = PropertyProxy.Instance().getProperty("asset/config/observer.properties", "observers").split(";");
        
        for(String className: observerArr)
        {
            IWakeupListener l = null;
            try {
                l = (IWakeupListener)(Class.forName(className).newInstance());
            } catch (InstantiationException | IllegalAccessException
                    | ClassNotFoundException e) {
                e.printStackTrace();
            }
            child.addWakeupListener(l);
        }
        
        new Thread(child).start();
    }
}