Hotel Room Reservation System 🏨

This project is a simple Hotel Room Reservation System implemented in Java. It simulates room allocation using Stacks and Queues, mimicking real-world hotel booking behavior and waiting lines.

📁 Project Structure

.
├── Main.java              # Entry point for the program
├── Room.java              # Room class definition
├── Reservation.java       # Reservation class definition
├── HotelSystem.java       # Core logic for room allocation, queue handling, etc.
└── reservations.txt       # Sample reservation input (CSV format)

🚀 Features

• Room types: Single, Double, Suite, and Deluxe
• Stack-based room allocation (LIFO)
• Queue-based waiting list when rooms are full (FIFO)
• Odd-numbered room release simulation
• Dynamic reallocation from waiting queues
• Final status report for room availability

📌 How It Works

1. Rooms are initialized and pushed to stacks by type.
2. Reservations are read from a reservations.txt file.
3. Reservations are either immediately allocated or placed in queues.
4. Booked odd-numbered rooms are released mid-process.
5. Re-check waiting queues after room releases.
6. The system outputs detailed logs at each step.

🏦 Input File Format

The input file must be named reservations.txt and follow this structure:

Reservation ID,Customer Name,Room Type
1,John Smith,Single
2,Ethan Thomas,Double
...

🧪 Example Run

You can run the system via the Main class:

javac *.java
java Main

📋 Sample Output

=== Initial Room Piles (Top -> Bottom) ===
Single Stack:
  Room#5 (Single) - Available
  ...
Suite Stack:
  Room#15 (Suite) - Available
...

=== Waiting Lines after processing waiting queues ===
Double Queue: [ReservationID: 30, Customer: Grace Baker, RoomType: Double]
...

=== Final Room Status ===
-- Unavailable Rooms --
  Room#2 (Single) - Unavailable
  ...
-- Available Rooms --
  Room#1 (Single) - Available
  ...

🛠️ Technologies Used

• Java (Core Java, Collections API)
• Stack, Queue, List, Map
• File I/O (Scanner)

📚 Concepts Covered

• Data Structures (Stack, Queue, HashMap)
• Object-Oriented Programming
• File Handling in Java
• Simulation & Process Modeling

📄 License

This project is for educational use. Feel free to use or modify it for learning or academic purposes.

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