Decoretor

次のようになります.

package com.pattern.decoretor.yzb;

public interface IDog {
  void move();
}

この犬は歩くだけだ.そうするとね.私のGWも歩くだけなので、まあ、下を見ればわかります.

package com.pattern.decoretor.yzb;
public class MyDog implements IDog{

	public void move() {
		System.out.println("MyDog can move");//GW	
	}
}

package com.pattern.decoretor.yzb;

public class YDog extends DogDecoretor {


	public YDog(IDog dog) {
		super(dog);
	
	}
	public void move() {
		super.move();
                  
			}
public void eatMoon(){

System.out.println("yydog can fly so eat moon!");// .

}

}

package com.pattern.decoretor.yzb;

public abstract class DogDecoretor implements IDog {
private IDog dog;
	public DogDecoretor(IDog dog){
		this.dog=dog;
	}
	public void move() {
		dog.move();
		eatMoon();

	}
public abstract void eatMoon();// .

}

package com.pattern.decoretor.yzb;

public class Test {
public static void main(String [] args){
	IDog dog=new MyDog();
	dog.move();//
           System.out.println("*********************");
	YDog y=new YDog(dog);
	y.move();//
	
}
}

結果:
MyDog can move
*********************
MyDog can move
yydog can fly so eat moon!