doorcloseobserver.java

该程序是用jbuilder制作

package myoven.door;
//需要预定关门事件的观察者的基类，声明recieveDoorCloseNotification(),所有子类必须实现该方法
public abstract class DoorCloseObserver {
  public DoorCloseObserver() {
  }
  public abstract void recieveDoorCloseNotification();
}