restaurantmanagementsystem

Restaurant Management System (LLD)

Problem Statement

Design and implement a Restaurant Management System that allows customers to make reservations, place orders, manage tables, generate bills, and process payments. The system should also support staff management and menu management.

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Requirements

• Table Management: The system manages tables, their availability, and assignments.
• Reservation Management: Customers can reserve tables in advance.
• Menu Management: The system manages a menu of items, including prices and descriptions.
• Order Placement: Customers can place orders for menu items.
• Order Tracking: The system tracks the status of each order (e.g., PLACED, PREPARING, SERVED, COMPLETED).
• Billing: The system generates bills for completed orders.
• Payment Processing: The system processes payments for bills.
• Staff Management: The system manages staff assignments (e.g., waiters, chefs).
• Extensibility: Easy to add new features such as customer feedback, loyalty programs, or online ordering.

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Core Entities

• RestaurantManagementSystem: Main class that manages tables, reservations, orders, menu, staff, and payments.
• Table: Represents a table in the restaurant, with table number, capacity, and availability.
• Reservation: Represents a reservation for a table by a customer.
• MenuItem: Represents an item on the menu, with name, description, and price.
• Order: Represents a customer's order, including items, status, and associated table.
• OrderItem: Represents an item in an order.
• OrderStatus: Enum for order status (PLACED, PREPARING, SERVED, COMPLETED).
• Bill: Represents the bill for an order, including total amount and payment status.
• Payment (in payment/): Represents a payment transaction for a bill.
• Staff: Represents a staff member (e.g., waiter, chef).

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Class Design

UML Class Diagram

1. RestaurantManagementSystem

• Fields: List tables, List reservations, List menu, List orders, List bills, List staff, PaymentProcessor paymentProcessor
• Methods: addTable(Table), addMenuItem(MenuItem), makeReservation(Reservation), placeOrder(Order), updateOrderStatus(Order, OrderStatus), generateBill(Order), processPayment(Bill, Payment), addStaff(Staff), etc.

2. Table

• Fields: int tableNumber, int capacity, boolean isAvailable

3. Reservation

• Fields: int id, Table table, String customerName, Date reservationTime

4. MenuItem

• Fields: int id, String name, String description, double price

5. Order

• Fields: int id, Table table, List items, OrderStatus status

6. OrderItem

• Fields: MenuItem menuItem, int quantity

7. OrderStatus (enum)

• Values: PLACED, PREPARING, SERVED, COMPLETED

8. Bill

• Fields: int id, Order order, double totalAmount, boolean isPaid

9. Payment (in payment/)

• Fields: int id, double amount, String method, PaymentStatus status

10. Staff

• Fields: int id, String name, String role

11. PaymentProcessor (in payment/)

• Methods: process(Payment), validate(Payment)

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Example Usage

RestaurantManagementSystem system = new RestaurantManagementSystem();
Table table = new Table(1, 4, true);
system.addTable(table);

MenuItem pizza = new MenuItem(1, "Pizza", "Cheese Pizza", 12.0);
system.addMenuItem(pizza);

Reservation reservation = new Reservation(1, table, "Alice", new Date());
system.makeReservation(reservation);

Order order = new Order(1, table, List.of(new OrderItem(pizza, 2)), OrderStatus.PLACED);
system.placeOrder(order);

Bill bill = system.generateBill(order);
Payment payment = new Payment(1, bill.getTotalAmount(), "CREDIT_CARD");
system.processPayment(bill, payment);

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Demo

See RestaurantManagementSystemDemo.java for a sample usage and simulation of the restaurant management system.

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Extending the Design

• Add customer feedback: Allow customers to rate their experience.
• Add loyalty programs: Track and reward repeat customers.
• Add online ordering: Support for online reservations and orders.

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