05-03-设计模式 装饰模式

package com.flower.zhaungshizhe;

import lombok.AllArgsConstructor;
import lombok.Data;

public class TestMain {
    public static void main(String[] args) {
        // 装饰者模式下订单 2份巧克力 + 一份牛奶 + 一份LongBlank咖啡
        // 一份LongBlank咖啡
        Drink drink = new LongBlack();
        // 添加一份牛奶
        drink = new Milk(drink);
        // 添加一份巧克力
        drink = new Chocolate(drink);
        // 添加二份巧克力
        drink = new Chocolate(drink);
        float cost = drink.cost();
        System.out.println("价格为:" + cost);
        System.out.println(drink.getDes());
    }
}

/**
 * 饮用抽象类
 */
@Data
abstract class Drink{
    public String des;
    private float price = 0.0F;
    // 计算价格
    public abstract float cost();
}

/**
 * 咖啡类
 */
class Coffee extends Drink{

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

/**
 * 意大利咖啡
 */
class Espresso extends Coffee{
    public Espresso(){
        setDes("意大利咖啡");
        setPrice(6.0F);
    }
}
/**
 * 美式咖啡
 */
class LongBlack extends Coffee{
    public LongBlack(){
        setDes("美式咖啡");
        setPrice(10.0F);
    }
}

/**
 * 装饰者
 */
@AllArgsConstructor
class Decorator extends Drink{
    // 被装饰者
    private Drink drink;
    @Override
    public float cost() {
        // 自身价格 + coffee价格
        return super.getPrice() + drink.cost();
    }

    @Override
    public String getDes() {
        return super.getDes() + " " + super.getPrice() + " && " + drink.getDes() + " " + drink.getPrice();
    }
}

/**
 * 巧克力
 */
class Chocolate extends Decorator{
    public Chocolate(Drink drink) {
        super(drink);
        setDes("巧克力调味品");
        setPrice(3.0F);
    }
}

/**
 * 牛奶
 */
class Milk extends Decorator{
    public Milk(Drink drink) {
        super(drink);
        setDes("牛奶调味品");
        setPrice(2.0F);
    }
}