<a href = "http://blog.csdn.net/u011240877/article/details/52683558">原文作者张拭心博客链接</a>
1. 首先定义 斧头帮老大 AxeGangBoss:
// 斧头帮老大，消息发送者，继承Observable
public class AxeGangBoss extends Observable {
private String strName;
public AxeGangBoss(String strName){
this.strName = strName;
}
public String getStrName() {
return strName;
}
public void setStrName(String strName) {
this.strName = strName;
}
public void sendMsg (String strMsg){// 给小弟发送消息
setChanged();
notifyObservers(strMsg);
}
}
2.定义 斧头帮小弟 AxeGangPeople:
// 斧头帮小弟,实现Observer接口
public class AxeGangPeople implements Observer {
private String strName;
public AxeGangPeople(String strName) {
this.strName = strName;
}
public String getStrName() {
return strName;
}
public void setStrName(String strName) {
this.strName = strName;
}
@Override
public void update(Observable observable, Object data) {
AxeGangBoss writer;
if(observable instanceof AxeGangBoss){
writer = (AxeGangBoss) observable;
Log.i("cctag", getStrName()+"收到来自:"+writer.getStrName()+"，的消息："+data.toString());
}
}
}
3.然后小弟去老大那登记，老大想做事就射穿云箭：
// 创建老大的实例对象
AxeGangBoss boss = new AxeGangBoss("带头大哥");
// 创建小弟的实例对象
AxeGangPeople p1 = new AxeGangPeople("路人甲");
AxeGangPeople p2 = new AxeGangPeople("路人乙");
AxeGangPeople p3 = new AxeGangPeople("路人丙");
// 老大将小弟收入麾下
boss.addObserver(p1);
boss.addObserver(p2);
boss.addObserver(p3);
// 老大射出穿云箭
boss.sendMsg("黄河大道东，速度来砍人。");
4.运行结果
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