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;@Overridepublic float price() {return redTeaPrice;}
}

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

package Bridge;public class MediumSize implements TeaSize{TeaKind teaKind;public MediumSize(TeaKind teaKind) {this.teaKind = teaKind;}@Overridepublic float getPrice() {return teaKind.price()*2;}
}

package Bridge;public class SuperSize implements TeaSize{private TeaKind teaKind;public SuperSize(TeaKind teaKind) {this.teaKind = teaKind;}@Overridepublic 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());}
}