---

Code Explanation

1. Class Definitions

public class HotelManagementSystem {

• This is the main class where everything happens. It contains helper classes (Room, Booking, and Hotel) and the main method for running the program.

---

2. Room Class

static class Room {
    int roomNumber;
    String type;
    double price;
    boolean isAvailable;

• Defines the Room class.
  • roomNumber: Stores the room number (e.g., 101).
  • type: Stores the type of room (e.g., "Single", "Double").
  • price: Stores the price per night.
  • isAvailable: Tracks if the room is available (true) or booked (false).

---

    public Room(int roomNumber, String type, double price) {
        this.roomNumber = roomNumber;
        this.type = type;
        this.price = price;
        this.isAvailable = true; // Rooms start as available
    }

• This is the constructor for the Room class. It initializes the room details like the room number, type, price, and marks the room as available by default.

---

    public void bookRoom() {
        isAvailable = false;
    }

    public void releaseRoom() {
        isAvailable = true;
    }

• bookRoom(): Marks the room as not available.
• releaseRoom(): Marks the room as available again.

---

    @Override
    public String toString() {
        return "Room " + roomNumber + " (" + type + ", $" + price + " per night) - " +
               (isAvailable ? "Available" : "Booked");
    }

• toString() is used to convert a room object to a readable string when printed. For example:
  • Available Room: Room 101 (Single, $100 per night) - Available
  • Booked Room: Room 101 (Single, $100 per night) - Booked

---

3. Booking Class

static class Booking {
    String customerName;
    Room room;
    int numberOfDays;

• Defines the Booking class.
  • customerName: Name of the person who booked the room.
  • room: The Room object associated with the booking.
  • numberOfDays: Number of days the room is booked for.

---

    public Booking(String customerName, Room room, int numberOfDays) {
        this.customerName = customerName;
        this.room = room;
        this.numberOfDays = numberOfDays;
    }

• The constructor initializes booking details with the customer name, room, and number of days.

---

    public double calculateTotalCost() {
        return room.price * numberOfDays;
    }

• Calculates the total cost for the booking by multiplying the room's price per night by the number of days.

---

    @Override
    public String toString() {
        return "Customer: " + customerName + ", Room: " + room.roomNumber +
               ", Days: " + numberOfDays + ", Total Cost: $" + calculateTotalCost();
    }

• Converts a Booking object into a readable string like:
  • Customer: John, Room: 101, Days: 3, Total Cost: $300

---

4. Hotel Class

static class Hotel {
    Room[] rooms = {
        new Room(101, "Single", 100),
        new Room(102, "Double", 150),
        new Room(103, "Suite", 250)
    };
    Booking[] bookings = new Booking[10];
    int bookingCount = 0;

• Hotel class manages rooms and bookings.
  • rooms: An array holding all the rooms available in the hotel.
  • bookings: A fixed-size array (10 bookings max) to store all bookings.
  • bookingCount: Keeps track of how many bookings have been made.

---

    public void showAvailableRooms() {
        System.out.println("\nAvailable Rooms:");
        for (Room room : rooms) {
            if (room.isAvailable) {
                System.out.println(room);
            }
        }
    }

• Displays all available rooms by looping through the rooms array and printing only those that are marked as isAvailable.

---

    public boolean bookRoom(int roomNumber, String customerName, int numberOfDays) {
        for (Room room : rooms) {
            if (room.roomNumber == roomNumber && room.isAvailable) {
                room.bookRoom();
                if (bookingCount < bookings.length) {
                    bookings[bookingCount++] = new Booking(customerName, room, numberOfDays);
                    return true;
                } else {
                    System.out.println("Booking limit reached.");
                    room.releaseRoom();
                    return false;
                }
            }
        }
        return false;
    }

• Books a room by:
  1. Finding a room with the given number that is available.
  2. Creating a new Booking object if there’s space in the bookings array.
  3. Returns true if booking is successful, otherwise false.

---

    public void showBookingDetails(int roomNumber) {
        for (Booking booking : bookings) {
            if (booking != null && booking.room.roomNumber == roomNumber) {
                System.out.println("\nBooking Details:");
                System.out.println(booking);
                return;
            }
        }
        System.out.println("No booking found for Room " + roomNumber + ".");
    }

• Displays booking details for a specific room by searching the bookings array.

---

    public boolean releaseRoom(int roomNumber) {
        for (Room room : rooms) {
            if (room.roomNumber == roomNumber && !room.isAvailable) {
                room.releaseRoom();
                System.out.println("Room " + roomNumber + " has been released.");
                return true;
            }
        }
        return false;
    }

• Releases (frees up) a booked room by marking it as available.

---

5. Main Method

public static void main(String[] args) {

• The entry point of the program where user interaction happens.

---

        while (true) {
            System.out.println("\n--- Hotel Management System ---");
            System.out.println("1. Show Available Rooms");
            System.out.println("2. Book a Room");
            System.out.println("3. Show Booking Details");
            System.out.println("4. Release a Room");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");

• Displays a menu for the user to interact with the hotel system.

---

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    hotel.showAvailableRooms();
                    break;

                case 2:
                    System.out.print("Enter Room Number to Book: ");
                    int roomToBook = scanner.nextInt();
                    scanner.nextLine();
                    System.out.print("Enter Customer Name: ");
                    String customerName = scanner.nextLine();
                    System.out.print("Enter Number of Days: ");
                    int numberOfDays = scanner.nextInt();
                    if (hotel.bookRoom(roomToBook, customerName, numberOfDays)) {
                        System.out.println("Room " + roomToBook + " booked successfully!");
                    } else {
                        System.out.println("Room " + roomToBook + " is not available.");
                    }
                    break;

• Allows the user to book a room by:
  1. Asking for room number, customer name, and days.
  2. Calling the bookRoom() method.

---

                case 3:
                    System.out.print("Enter Room Number to Check Booking: ");
                    int checkRoomNumber = scanner.nextInt();
                    hotel.showBookingDetails(checkRoomNumber);
                    break;

• Allows the user to view booking details for a specific room.

---

                case 4:
                    System.out.print("Enter Room Number to Release: ");
                    int roomToRelease = scanner.nextInt();
                    if (!hotel.releaseRoom(roomToRelease)) {
                        System.out.println("Room " + roomToRelease + " is not currently booked.");
                    }
                    break;

• Lets the user release a booked room.

---

                case 5:
                    System.out.println("Exiting...");
                    scanner.close();
                    return;

• Exits the program when the user selects option 5.

---