我必须为酒店设计和实现预订系统。我有
- 预订对象的数组列表
- 房间对象的数组列表
我想在指定日期“预订”房间。
预订没有日期的房间很容易,但日期部分却让事情变得复杂。我正在为此设计而苦苦挣扎,并且有信心朝着正确的方向轻推我可以对其进行编码。
怎么说一个房间在这个日期被预订但那个日期没有?
没有数据库或任何东西,它只是一个抽象的预订系统。
(我已经盯着这个看了一段时间,如果解决方案很简单,请原谅我)
谢谢。
最佳答案
创建三个类(Hotel
、Room
& Reservation
):
Reservation
对象在这里用作发票,并且与预订流程分离。每个
Room
对象(专用于酒店中的每个房间号)都包含一个map
,它存储reservedDates
作为键和reservationObject
作为值。酒店
由房间
组成。对于每个预订请求,Hotel
循环遍历room
列表,每个room
遍历自己的map
查找是否可以预订要求 天。
请注意,预订功能将日期作为列表,而不仅仅是两个日期(如开始日期和结束日期)。这与前者可以从后者推导出来是一样的。
示例代码如下:
class Hotel {
private String name, address;
private List<Room> roomList; //key : roomNumber
public Hotel(){
roomList = new ArrayList<Room>();
}
public Reservation bookRoomForDates(List<Integer> dateList, Guest guest){
for(Room room : roomList){
Reservation reservation = room.bookForGivenDates(dateList, guest);
if(reserved != null) return reservation; //Reservation successFull!
}
return null; //Reservation failed!
}
}
class Reservation {
private String id;
private Date inDate, outDate;
private Guest guest;
public Reservation(Room room, int startDate, int endDate, Guest guest){
//populate the member variables.
}
}
class Room {
private String id;
private int roomNumber, floorNum;
private Map<Integer, Reservation> reservedDates; // key : date as Integer (YYYYMMDD)
public Room(int roomNumber){
reservedDates = new HashMap<Integer, Reservation>();
this.roomNumber = roomNumber;
}
//A guest request for booking on dates(in YYYYMMDD format) in the dateList
public Reservation bookForGivenDates(List<Integer> dateList, Guest guest)
{
if(dateList.isEmpty()) return null;
for(Integer date : dateList){
Reservation res = reservedDates.get(date);
if(res != null) { // We don't store null value for unreserved dates for the room.
return null; // Room is reserved on this date by another guest. So, this room is unavailable.
}
}
//this room is unreserved on all requested dates. So go on and reserve this room for asked dates
int startDate = dateList.get(0);
int endDate = dateList.get(dateList.size() - 1);
Reservation newReservation = new Reservation(this, startDate, endDate, guest);
for(Integer date : dateList){
reservedDates.put(date, newReservation);
}
return newReservation;
}
}
关于java - 设计问题 : Reservation system,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8113070/