OO问题

设计一个在线的酒店预订系统，并且可以通过城市搜索出来

解决办法：

Main Class：
    User
    Room
    Hotel
    Booking
    Adress

Enums :
房间的状态和类型
public enum RoomStatus {
    EMPTY
    NOT_EMPTY;
}

public enum RoomType{
    SINGLE,
    DOUBLE,
    TRIPLE;
}

public enum PaymentStatus {
    PAID,
    UNPAID;
}

class User{

int userId;
String name;
Date dateOfBirth;
String mobNo;
String emailId;
String sex;
}

// For the room in any hotel
class Room{

int roomId;
int hotelId;
RoomType roomType;
RoomStatus roomStatus;
}

class Hotel{

int hotelId;
String hotelName;
Adress adress;
List<Room> rooms; // hotel contains the list of rooms
float rating;
Facilities facilities;
}

// a new booking is created for each booking done by any user
class Booking{
    int bookingId;
    int userId;
    int hotelId; 
    List<Rooms> bookedRooms; 
    int amount;
    PaymentStatus status_of_payment;
    Time bookingTime;
    Duration duration;
}

class Address{

string city;
string pinCode;
string streetNo;
string landmark;
}

class Duration{

Time from;
Tiime to;
}

class Facilities{

bool provides_lift;
bool provides_power_backup;
bool provides_hot_water;
bool provides_breakfast_free;
}

但如何跟踪多用户的的房间，所以我觉得这里房间改成接口更好，然后不同类型的房间继承room，并且发布不同的价格。