QuickBite

QuickBite is a comprehensive, Java-based Online Food Delivery Management System built to demonstrate the practical integration of fundamental computer science concepts within a modern, production-style web architecture. Operating on Jakarta Servlet and JSP specifications under Apache Tomcat, the platform provides a complete MVC-compliant ecosystem for customers to order meals and administrators to manage menus and process fulfillments.

Rather than relying on off-the-shelf framework tools, databases, or third-party queue systems, QuickBite focuses on custom implementations of classic data structures and algorithms:

1. **Circular Queue for Order Management**: A custom-implemented circular queue (`CustomOrderQueue`) is used to queue and confirm incoming pending orders in a strictly fair First-In-First-Out (FIFO) manner. Capable of handling a fixed capacity of 100 concurrent orders, it utilizes circular modulo arithmetic to achieve constant-time O(1) complexity for both enqueue (`addOrder`) and dequeue (`removeOrder`) operations, avoiding the latency and memory shifting overhead of standard dynamic arrays.

2. **QuickSort Algorithm for Menu Sorting**: A custom QuickSort engine in the `FoodItemService` allows customers to sort menu items by price in O(n log n) average time complexity, offering immediate, budget-friendly food filtering in both ascending and descending configurations.

Data persistence is handled through a lightweight, custom flat-file database using CSV serialization and deserialization routines to store users, categories, menu items, and order logs. The interface provides a modern user experience with dynamic CSS micro-animations, real-time notification alerts, and AJAX/Fetch API-driven asynchronous order cancellations without full-page reloads.