package?dyl.study.observer;

import?java.util.Observable;

public?class?ConcreteWeatherSubject?extends?Observable?{
	//天氣情況的內容
	private?String?content;

	public?String?getContent()?{
		return?content;
	}

	public?void?setContent(String?content)?{
		this.content?=?content;
		this.setChanged();
		this.notifyObservers(content);?//推方式
	}
	
}

package?dyl.study.observer;

import?java.util.Observable;
import?java.util.Observer;
//具體的觀察者對象
public?class?ConcreteObserver?implements?Observer?{
	private?String?observerName;
	@Override
	public?void?update(Observable?o,?Object?arg)?{
		//推方式
		System.out.println(observerName+"收到了"+arg);
		//拉方式
		System.out.println(observerName+"收到了消息，主動到目標對象那去取得數據，取得的數據為："+((ConcreteWeatherSubject)o).getContent());
	}
	public?String?getObserverName()?{
		return?observerName;
	}
	public?void?setObserverName(String?observerName)?{
		this.observerName?=?observerName;
	}

}

package?dyl.study.observer;

public?class?Client?{
	public?static?void?main(String[]?args)?{
		ConcreteWeatherSubject?subject?=?new?ConcreteWeatherSubject();
		ConcreteObserver?p1?=?new?ConcreteObserver();
		ConcreteObserver?p2?=?new?ConcreteObserver();
		p1.setObserverName("我");
		p2.setObserverName("你");
		subject.addObserver(p1);
		subject.addObserver(p2);
		subject.setContent("QQ天氣：【某地】陰7°/10°，09:05更新~");
	}
}