using System;
namespace Test
{
    enum E_RoomType
    {
        Bedroom,
        LivingRoom
    }
    class Bedroom : IChangeRoom
    {
        public void ChangeRoom()
        {
            Console.WriteLine("卧室");
        }
    }
    class LivingRoom : IChangeRoom
    {
        public void ChangeRoom()
        {
            Console.WriteLine("客厅");
        }
    }
    interface IChangeRoom
    {
        void ChangeRoom() { }
    }
    class Show
    {
        IChangeRoom room;
        public Show()
        {
            room = new Bedroom();
        }
        public Show(IChangeRoom room)
        {
            this.room = room;
        }
        public void ShowRoom()
        {
            room.ChangeRoom();
        }

    }
    
    class Program
    {
        static void Main(string[] args)
        {
            Show s1 = new Show();
            Show s2 = new Show(new LivingRoom());
            s1.ShowRoom();
            s2.ShowRoom();
        }
    }
}