public static void main(String[] args) {
Boss Boss = new Boss("老板", "在办公室");
Guard guard = new Guard("前台");
Boss.addObserver(guard);
Boss.getState();
Boss.setState("离开了");
Boss.setState("回来了");
}
@Override
public void update(Observable o, Object arg) {
Boss boss = (Boss) o;
System.out.println(this.getName() + "报告" + boss.getName() + boss.getState());
}