無法獲得裝飾模式工作

Question

請參閱下面的代碼。我看不到我錯在哪裏。我也很困惑！非常感謝您的幫助！

package code; 

public class Client { 

public static void main(String[] args){ 

    proxyPlane plane = new proxyPlane(new Pilot(18)); 
     plane.flyPlane(); 

     plane = new proxyPlane(new Pilot(25)); 
     plane.flyPlane(); 

     DecoratedPilot decPilot = new Pilot(35); 

     System.out.println("Experienced Pilot of age " + Pilot.Age() + " " + decPilot.getDecotation()); 
    } 

} 


package code; 

public interface DecoratedPilot { 

public String getDecotation(); 
} 


package code; 

public class Decoration extends PilotDecorator { 

public Decoration(Pilot pilot) { 
    super(pilot); 
    // TODO Auto-generated constructor stub 
} 

@Override 
public String getDecotation() { 
    return "Pilot has earned his Commercial Wings"; 
} 
} 


package code; 

public abstract class PilotDecorator implements DecoratedPilot { 

public PilotDecorator(Pilot pilot) 
{ 
    apilot = pilot; 
} 
} 


package code; 

public class Pilot implements DecoratedPilot { 

private static int age; 

public static int Age() { 

    return age; 
} 

public Pilot(int age){ 

    Pilot.age = age; 
} 

public String getDecotation() { 
    // TODO Auto-generated method stub 
    return null; 
} 
} 

Answer 1

問題是你實際上並沒有裝飾任何東西。也就是說，你不是用裝飾器「包裝」一個Component。

下面是Decorator pattern的示例。

這種模式的一個很好的例子是在書中：Head First Design Patterns。我真的很喜歡這本書，如果你還沒有這本書，我強烈推薦它。

Answer 2

這裏：

---

 package code; 

     public class Client { 

      public static void main(String[] args) { 
       // -- A standard pilot 
       Pilot standardPilot = new StandardPilot(35); 
       System.out.println("Pilot : " + standardPilot.getAge() + " - " + standardPilot.getDescription()); 
       // -- A decorated pilot 
       Pilot decoratedPilot = new DecoratedPilot(standardPilot); 
       System.out.println("Pilot : " + decoratedPilot.getAge() + " - " + decoratedPilot.getDescription()); 
      } 
     } 

---

 package code; 

     public interface Pilot { 
      int getAge(); 
      String getDescription(); 
     } 

---

package code; 

    public class StandardPilot implements Pilot { 

     private int age; 

     public StandardPilot(int age) { 
      this.age = age; 
     } 

     @Override 
     public int getAge() { 
      return age; 
     } 

     @Override 
     public String getDescription() { 
      return "Standard Pilot"; 
     } 

}

---

package code; 

public class DecoratedPilot implements Pilot { 

    private Pilot pilot; 

    public DecoratedPilot(Pilot pilot) { 
     // todo : check not null 
     this.pilot = pilot; 
    } 

    @Override 
    public int getAge() { 
     return pilot.getAge(); 
    } 

    @Override 
    public String getDescription() { 
     return "Decorated Pilot"; 
    } 
} 

如果你需要幾個裝飾器，你可以製作DecoratedPilot抽象並從中繼承每個特定的裝飾器。