装饰者模式

最新推荐文章于 2025-05-14 22:27:35 发布

敲着敲着头发没了

最新推荐文章于 2025-05-14 22:27:35 发布

阅读量100

点赞数

文章标签：设计模式

本文链接：https://blog.youkuaiyun.com/weixin_46170033/article/details/107839032

版权

装饰者模式

饮品抽象类

abstract class Drink {
    public String des; //描述
    private float price = 0.0f;

    public String getDes() {
        return des;
    }

    public void setDes(String des) {
        this.des = des;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public abstract float cost();
}

所有咖啡的父类

class Coffee extends Drink {
    @Override
    public float cost() {
        return super.getPrice();
    }
}

不同咖啡的实现类

class Espresso extends Coffee {
    public Espresso() {
        setDes("意大利咖啡");
        setPrice(6.0f);
    }
}

class LongBlack extends Coffee {
    public LongBlack() {
        setDes("LongBlack");
        setPrice(5.0f);
    }
}

class ShortBlack extends Coffee {
    public ShortBlack() {
        setDes("ShortBlack");
        setPrice(4.0f);
    }
}

配料的父类（装饰者）

class Decorator extends Drink {
    private Drink obj;

    public Decorator(Drink obj) {
        this.obj = obj;
    }

    @Override
    public float cost() {
        return super.getPrice() + obj.cost();
    }

    public String getDes() {
        return super.getDes() +"&"+obj.getDes();
    }
}

不同配料的实现类

class Chocolate extends Decorator {
    public Chocolate(Drink obj) {
        super(obj);
        setDes("巧克力");
        setPrice(3.0f);
    }
}

class Milk extends Decorator {
    public Milk(Drink obj) {
        super(obj);
        setDes("牛奶");
        setPrice(2.5f);
    }
}

class Soy extends Decorator {
    public Soy(Drink obj) {
        super(obj);
        setDes("豆浆");
        setPrice(1.5f);
    }
}

测试类

public class DecoratorTest {
    public static void main(String[] args) {
        Drink order = new LongBlack();
        System.out.println(order.cost());//5.0
        System.out.println(order.getDes());//LongBlack
        order = new Milk(order);
        System.out.println(order.cost());//7.5
        System.out.println(order.getDes());//牛奶&LongBlack
        order = new Chocolate(order);
        System.out.println(order.cost());//10.5
        System.out.println(order.getDes());//巧克力&牛奶&LongBlack
    }
}