timer_cancelbuttonobserver.java

该程序是用jbuilder制作

package myoven.observer;
import myoven.button.*;
import myoven.timer.*;
/*
 为timer预定取消按钮的单击事件
 当用户取消烹饪时候，通知计时器停止工作并且设剩余时间为0
 */
public class Timer_CancelButtonObserver extends ButtonObserver {
  Timer time=Timer.getInstance();//得到计时器的唯一实例
  public Timer_CancelButtonObserver() {
  }
  public void recieveButtonNotification() {
    time.off();
    time.setTimeToZero();
  }

}