设计模式之装饰器模式 Decorator 包装模式 wrapp…

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;
    }

}