装饰者模式

package com.life.design.decorator;

public abstract class Coffee {
    private String des;
    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 Coffee(String des, float price) {
        this.des = des;
        this.price = price;
    }
    public float cost() {
        return price;
    }
}

package com.life.design.decorator;

public class Espresso extends Coffee {
    
    public Espresso() {
        super("蒸馏咖啡",6.0f);
    }
}

package com.life.design.decorator;

public class Decorator extends Coffee {
    private Coffee obj;

    public Decorator(Coffee obj, String des, float price) {
        super(des, price);
        this.obj = obj;
    }

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

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

package com.life.design.decorator;

public class Chocolate extends Decorator {

    public Chocolate(Coffee obj) {
        super(obj,"巧克力",3.0f);
    }
}