软件设计之桥接模式

实现茶水间：茶可以分红茶和绿茶，每种茶又可以分大杯和中杯，现在你是服务员需要计算茶水的价格。

package Bridge;

public class BlackTea implements TeaKind{
    private float redTeaPrice = 2.0f;
    @Override
    public float price() {
        return redTeaPrice;
    }
}

package Bridge;

public class GreenTea implements TeaKind{
    private float greenTeaPrice = 3.0f;
    @Override
    public float price() {
        return greenTeaPrice;
    }
}

package Bridge;

public class MediumSize implements TeaSize{
    TeaKind teaKind;

    public MediumSize(TeaKind teaKind) {
        this.teaKind = teaKind;
    }

    @Override
    public float getPrice() {
        return teaKind.price()*2;
    }
}

package Bridge;

public class SuperSize implements TeaSize{
    private TeaKind teaKind;

    public SuperSize(TeaKind teaKind) {
        this.teaKind = teaKind;
    }

    @Override
    public float getPrice() {
        return teaKind.price()*3;
    }
}

package Bridge;

public interface TeaKind {
    public abstract float price();
}

package Bridge;

public interface TeaSize {
    public abstract float getPrice();
}

package Bridge;

public class Client {
    public static void main(String[] args) {
        TeaSize tea1 = new MediumSize(new GreenTea());
        System.out.println("绿茶中杯的价格：" + tea1.getPrice());
        TeaSize tea2 = new SuperSize(new GreenTea());
        System.out.println("绿茶大杯的价格：" + tea2.getPrice());
        TeaSize tea3 = new MediumSize(new BlackTea());
        System.out.println("红茶中杯的价格：" + tea3.getPrice());
        TeaSize tea4 = new SuperSize(new BlackTea());
        System.out.println("红茶大杯的价格：" + tea4.getPrice());
    }
}