Code for the Hotel Management System

Write the object-oriented code to implement the design of the hotel management system problem.

We'll cover the following

Hotel management system classes
Wrapping up

We’ve reviewed different aspects of the hotel management system and observed the attributes attached to the problem using various UML diagrams. Let’s explore the more practical side of things, where we will work on implementing the hotel management system using multiple languages. This is usually the last step in an object-oriented design interview process.

We have chosen the following languages to write the skeleton code of the different classes present in the hotel management system:

Java
C#
Python
C++
JavaScript

Hotel management system classes#

In this section, we’ll provide the skeleton code of the classes designed in the class diagram lesson.

Note: For simplicity, we are not defining getter and setter functions. The reader can assume that all class attributes are private and accessed through their respective public getter methods and modified only through their public methods function.

Enumerations#

First, we will define all the enumerations required in the hotel management system. According to the class diagram, there are six enumerations used in the system, i.e., RoomStyle, RoomStatus, BookingStatus, AccountStatus, AccountType, and PaymentStatus. The code to implement these enumerations is as follows:

Note: JavaScript does not support enumerations, so we will be using the Object.freeze() method as an alternative that freezes an object and prevents further modifications.

// definition of enumerations used in hotel management system
enum RoomStyle {
    STANDARD, 
    DELUXE, 
    FAMILY_SUITE, 
    BUSINESS_SUITE
}
enum RoomStatus {
    AVAILABLE, 
    RESERVED, 
    OCCUPIED, 
    NOT_AVAILABLE, 
    BEING_SERVICED, 
    OTHER
}
enum BookingStatus {
    REQUESTED, 
    PENDING, 
    CONFIRMED,
    CANCELLED, 
    ABANDONED
}
enum AccountStatus {
    ACTIVE, 
    CLOSED, 
    CANCELED, 
    BLACKLISTED, 
    BLOCKED

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Enum definitions

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The Address and Account classes

public abstract class Person {
    private String name;
    private Address address;
    private String email;
    private String phone;
    private Account account;
}
public class Guest extends Person {
    private int totalRoomsCheckedIn;
    public List<RoomBooking> getBookings();
}
public class Receptionist extends Person {
    public List<Member> searchMember(String name);
    public boolean createBooking();
}
public class Housekeeper extends Person {
    public boolean assignToRoom();
}

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Person and its child classes

public abstract class Service {
    private Date issueAt;
    public boolean addInvoiceItem(Invoice invoice);
}
public class Amenity extends Service {
    private String name;
    private String description;
}
public class RoomService extends Service {
    private boolean isChargeable;
    private Date requestTime;
}
public class KitchenService extends Service {
    private String description;
}

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Service and its derived classes

public class RoomBooking {
    private String reservationNumber;
    private Date startDate;
    private int durationInDays;
    private BookingStatus status;
    private Date checkin;
    private Date checkout;
    private int guestId;
    private Room room;
    private Invoice invoice;
    private List<Notification> notifications;
    public static RoomBooking fectchDetails(String reservationNumber);
}

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The RoomBooking class

// BillTransaction is an abstract class
public abstract class BillTransaction {
    private Date creationDate;
    private double amount;      
    private PaymentStatus status;
    public abstract void initiateTransaction();
}
class CheckTransaction extends BillTransaction {
    private String bankName;
    private String checkNumber;
    public void initiateTransaction() {
        // functionality 
    }
}
class CreditCardTransaction extends BillTransaction {
    private String nameOnCard;
    private int zipcode;
    public void initiateTransaction() {
        // functionality 
    }
}
class CashTransaction extends BillTransaction {
    private double cashTendered;
    public void initiateTransaction() {

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BillTransaction and its derived classes

// Notification is an abstract class
public abstract class Notification {
    private int notificationId;
    // The Date data type represents and deals with both date and time.
    private Date createdOn;      
    private String content;
    public abstract void sendNotification(Person person);
}
class SMSNotification extends Notification {
    public void sendNotification(Person person) {
        // functionality 
    }
}
class EmailNotification extends Notification {
    public void sendNotification(Person person) {
        // functionality 
    }
}

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Notification and its derived classes

public class Room {
    private String roomNumber;
    private RoomStyle style;
    private RoomStatus status;
    private double bookingPrice;
    private boolean isSmoking;
    private List<RoomKey> keys;
    private List<RoomHousekeeping> housekeepingLog;
    public boolean isRoomAvailable();
    public boolean checkin();
    public boolean checkout();
}
public class RoomKey {
    private String keyId;
    private String barcode;
    private Date issuedAt;
    private boolean isActive;
    private boolean isMaster;
    public boolean assignRoom(Room room);
}
public class RoomHousekeeping
{
    private String description;
    private Date startDatetime;
    private int duration;
    private Housekeeper housekeeper;

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The Room, RoomKey and RoomHousekeeping classes

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The Search interface and Catalog class

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The HotelBranch and Hotel classes

Activity Diagram for the Hotel Management System

Getting Ready: The Amazon Online Shopping System