/**
* 定義事件對象，必須繼承EventObject
*/
public class DoorEvent extends EventObject {

 private static final long serialVersionUID = 6496098798146410884L;

 private String doorState = "";// 表示門的狀態(tài)，有“開”和“關(guān)”兩種

 public DoorEvent(Object source, String doorState) {
  super(source);
  this.doorState = doorState;
 }

 public void setDoorState(String doorState) {
  this.doorState = doorState;
 }

 public String getDoorState() {
  return this.doorState;
 }

}

/**
* 定義監(jiān)聽接口，負(fù)責(zé)監(jiān)聽DoorEvent事件
*/

public interface DoorListener extends EventListener {
  public void doorEvent(DoorEvent event);
}

/**
* 該類為 門1監(jiān)聽接口的實(shí)現(xiàn)，做具體的開門，關(guān)門動(dòng)作
*/


public class DoorListener1 implements DoorListener {
 @Override
 public void doorEvent(DoorEvent event) {
  // TODO Auto-generated method stub
  if (event.getDoorState() != null && event.getDoorState().equals("open")) {
   System.out.println("門1打開");
  } else {
   System.out.println("門1關(guān)閉");
  }
 }

}

/**

* 該類為 門2監(jiān)聽接口的實(shí)現(xiàn)，做具體的開門，關(guān)門，以及開燈，關(guān)燈動(dòng)作
*/


public class DoorListener2 implements DoorListener {

 @Override
 public void doorEvent(DoorEvent event) {
  // TODO Auto-generated method stub
  if (event.getDoorState() != null && event.getDoorState().equals("open")) {
   System.out.println("門2打開，同時(shí)打開走廊的燈");
  } else {
   System.out.println("門2關(guān)閉，同時(shí)關(guān)閉走廊的燈");
  }
 }

}

/**
* 事件源對象，在這里你可以把它想象成一個(gè)控制開門關(guān)門的遙控器，
* (如果是在swing中，就類似一個(gè)button)
*/


public class DoorManager {
 private Collection listeners;

 /**
  * 添加事件
  * 
  * @param listener
  *   DoorListener
  */
 public void addDoorListener(DoorListener listener) {
  if (listeners == null) {
   listeners = new HashSet();
  }
  listeners.add(listener);
 }

 /**
  * 移除事件
  * 
  * @param listener
  *   DoorListener
  */
 public void removeDoorListener(DoorListener listener) {
  if (listeners == null)
   return;
  listeners.remove(listener);
 }

 /**
  * 觸發(fā)開門事件
  */
 protected void fireWorkspaceOpened() {
  if (listeners == null)
   return;
  DoorEvent event = new DoorEvent(this, "open");
  notifyListeners(event);
 }

 /**
  * 觸發(fā)關(guān)門事件
  */
 protected void fireWorkspaceClosed() {
  if (listeners == null)
   return;
  DoorEvent event = new DoorEvent(this, "close");
  notifyListeners(event);
 }

 /**
  * 通知所有的DoorListener
  */
 private void notifyListeners(DoorEvent event) {
  Iterator iter = listeners.iterator();
  while (iter.hasNext()) {
   DoorListener listener = (DoorListener) iter.next();
   listener.doorEvent(event);
  }
 }
}

/**
* 主程序，就想象成要開門的哪個(gè)人
*/


public class DoorMain {
 public static void main(String[] args) {
  DoorManager manager = new DoorManager();
  manager.addDoorListener(new DoorListener1());// 給門1增加監(jiān)聽器
  manager.addDoorListener(new DoorListener2());// 給門2增加監(jiān)聽器
  // 開門
  manager.fireWorkspaceOpened();
  System.out.println("我已經(jīng)進(jìn)來了");
  // 關(guān)門
  manager.fireWorkspaceClosed();
 }
}