体系结构突击（装饰者模式）

奶茶店有很多饮料可以抽象成Drink（名字，价格），然后每个饮料分别去实现这个抽象类，我们可以自己去加配料，比如布丁，蓝莓。建立一个新的抽象类去继承Drink并声明一个Drink对象，然后通过新的抽象类decorater的实现类去装饰Drink，为Drink添加新的描述。

public abstract class Drink {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public abstract double getPrince();
}

public class Coffee extends Drink{
    Coffee(){
        setName("咖啡");
    }
    @Override
    public double getPrince() {
        return 8;
    }
}

public class Tea extends Drink{
    Tea(){
        setName("茶");
    }
    @Override
    public double getPrince() {
        return 5;
    }
}

public abstract class Condiment extends Drink{
    private String name;
}

public class Pudding extends Condiment{
    Drink drink ;

    public Pudding(Drink drink) {
        this.drink = drink;
    }

    @Override
    public double getPrince() {
        return 1+drink.getPrince();
    }

    @Override
    public String getName() {
        return "布丁"+drink.getName();
    }
}

public class BlueBerry extends Condiment{
    Drink drink ;

    public BlueBerry(Drink drink) {
        this.drink = drink;
    }

    @Override
    public String getName() {
        return "蓝莓"+drink.getName();
    }

    @Override
    public double getPrince() {
        return 1.5+drink.getPrince();
    }
}

public class client {
    public static void main(String[] args) {
        Drink s = new Coffee();
        s= new BlueBerry(s);
        s= new Pudding(s);
        System.out.println("你点的是"+s.getName()+" 价格是"+s.getPrince());
    }
}