装饰器模式 Decorator 结构型 设计模式 (十)详解程序员

package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:手抓饼接口 描述抽象的手抓饼 
*/ 
public interface HandPancake { 
/** 
* 提供手抓饼 
*/ 
String offerHandPancake(); 
/**计算手抓饼的价格 
* @return 
*/ 
Integer calcCost(); 
} 
 
package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description: Noteless 家的手抓饼 
*/ 
public class NotelessHandPancake implements HandPancake { 
/** 
* 提供noteless 家的手抓饼一份 
*/ 
@Override 
public String offerHandPancake() { 
return " noteless 家的手抓饼"; 
} 
/**计算 noteless 家 一份手抓饼的价格 
* @return 
*/ 
@Override 
public Integer calcCost() { 
return 3; 
} 
}

package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:装饰器类实现了手抓饼接口,具有了手抓饼的类型 
*/ 
public abstract class Decorator implements HandPancake{ 
private HandPancake handPancake; 
Decorator(HandPancake handPancake){ 
this.handPancake = handPancake; 
} 
/**提供手抓饼 
* @return 
*/ 
@Override 
public String offerHandPancake() { 
return handPancake.offerHandPancake(); 
} 
 
/**提供手抓饼的价格 
* @return 
*/ 
@Override 
public Integer calcCost() { 
return handPancake.calcCost(); 
} 
}

package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:培根 
*/ 
public class Bacon extends Decorator { 
    Bacon(HandPancake handPancake){ 
        super(handPancake); 
    } 
 
    @Override 
    public String offerHandPancake() { 
        return super.offerHandPancake()+" 加培根"; 
    } 
    @Override 
    public Integer calcCost() { 
        return super.calcCost()+4; 
    } 
} 
 
package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:鸡蛋 
*/ 
public class Egg extends Decorator { 
    Egg(HandPancake handPancake){ 
        super(handPancake); 
    } 
    @Override 
    public String offerHandPancake() { 
        return super.offerHandPancake()+"加鸡蛋"; 
    } 
    @Override 
    public Integer calcCost() { 
        return super.calcCost()+2; 
    } 
} 
 
package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:烤肠 
*/ 
public class Sausage extends Decorator { 
    Sausage(HandPancake handPancake){ 
        super(handPancake); 
    } 
    @Override 
    public String offerHandPancake() { 
        return super.offerHandPancake()+" 加香肠"; 
    } 
    @Override 
    public Integer calcCost() { 
        return super.calcCost()+3; 
    } 
} 
 
package decorator; 
/** 
* Created by noteless on 2018/9/6. 
* Description:青菜 
*/ 
public class Vegetable extends Decorator { 
    Vegetable(HandPancake handPancake){ 
        super(handPancake); 
    } 
    @Override 
    public String offerHandPancake() { 
        return super.offerHandPancake()+" 加青菜"; 
    } 
    @Override 
    public Integer calcCost() { 
        return super.calcCost()+1; 
    } 
 
}