獲取父級字段值而不是應該覆蓋父級的子字段

嘗試獲取子級字段獲取父級字段時。在此示例中，當創建新的DarkRoom時，int零將傳遞給DarkRoom構造函數。它應該將零int分配給thisRoomNumber字段。下一步 - 創建Tenant並傳遞我們初始化的一個對象DarkRoom。由於某種原因Semaphore類nextRoom具有字段thisRoomNumber從Room繼承和價值96儘管事實我們指定爲零。什麼不見了？爲什麼我不能從nextRoom.thisRoomNumber得到0設計是相當複雜的，也許有一個更簡單的解決方案？獲取父級字段值而不是應該覆蓋父級的子字段

public abstract class Room { 
public int thisRoomNumber = 96; 
}

主要方法：

public class TestCase { 
    public static void main(String[] args) { 
    Room s[] = new Room[1]; 
      {  
       s[0] = new DarkRoom(0, s); 
       } 
     new Tenant("Joe", s[0], s); 
     } 
    }

暗房類：

public class DarkRoom extends Room { 

private Room thisRoomType = this; 
public int thisRoomNumber; 
private Room[] rooms; 
private Semaphore semaphore= new Semaphore(); 
@Override 
void leave(Tenant t) { 
    semaphore.release(thisRoomType, rooms, t); 
} 
public int thisRoomNumber; 

public DarkRoom(int i, Room[] s) { 

     this.thisRoomNumber = i; 
     this.rooms = s; 
    } 
}

Semaphore類：

public class Semaphore { 
public synchronized void release(Room thisRoom, Room[] allRooms, Tenant t) { 
Room nextRoom; 

     while(j < allRooms.length && 

      allRooms[j].negativeCounter == 0 && 

      thisRoom.getClass().equals(allRooms[j].getClass())){ 

      j++; 
     } 
nextRoom = allRooms[j]; 
System.out.println(nextRoom.getClass().getName() +"' "+nextRoom.thisRoomNumber);

來源

2012-04-30 J.Olufsen