🗂️ ToDo List Manager – Data Structures Project 📌 Project Overview

The ToDo List Manager is a Java Swing-based desktop application developed as part of a Data Structures and Algorithms course project.

It demonstrates the practical implementation of core data structures in a real-world, event-driven application with a clean and modular GUI.

The system is designed using Object-Oriented Design principles and follows a lightweight MVC architecture for better maintainability and separation of concerns.

🧠 Core Data Structures Implemented LinkedList – Maintains dynamic task storage with efficient insertions and deletions Stack – Implements LIFO-based urgent task management system ArrayList – Stores completed tasks for fast iteration and retrieval HashMap<String, Task> – Provides O(1) task lookup using unique identifiers HashMap-based indexing – Enables efficient keyword-based task searching ✨ Key Features

✔ Add, update, and delete tasks with real-time updates ✔ Priority-based task classification system ✔ Efficient task search using optimized in-memory indexing ✔ Stack-based urgent task handling (LIFO operations) ✔ Task completion tracking with history management ✔ Persistent storage using Java Serialization ✔ Secure login authentication system ✔ Responsive and user-friendly Java Swing GUI

⚙️ System Architecture Architecture Style: MVC (Model-View-Controller) Design Approach: Object-Oriented Modular Design Data Handling: In-memory + file-based persistence UI Layer: Java Swing event-driven interface 📊 Time Complexity Analysis Add Task: O(1) – Direct insertion into LinkedList Search by ID: O(1) – HashMap lookup Search by Title: O(n) – Linear traversal of dataset Delete Task: O(n) – Search + removal operation Sort Tasks: O(n log n) – Comparator-based sorting 🚀 How to Run Requirements: Java JDK 8 or higher IntelliJ IDEA / NetBeans / Eclipse Steps: Clone or download the repository Open project in Java IDE Configure JDK 8+ Run TaskManagerGUI.java Default Login: Username: lara Password: lara123 🔐 Security Considerations Default credentials are for development/testing only Production systems should implement password hashing (BCrypt recommended) Future improvements should include role-based access control (RBAC) 🐛 Limitations Single-user desktop application (no concurrency support) Local file-based persistence only No cloud synchronization No database integration 🚀 Future Enhancements Multi-user authentication system Database integration (MySQL / PostgreSQL) Cloud-based task synchronization Mobile companion application Task categories, tags, and filtering system Export functionality (PDF/CSV reports) Dark mode UI theme 🎓 Key Learning Outcomes Practical implementation of linear and non-linear data structures Real-world application of algorithmic complexity concepts Java Swing-based GUI development File handling and serialization techniques Secure authentication system design Modular software architecture principles 👤 Author

Sidra Hayat GitHub: @Sidra-Hayat

📌 Project Type

Academic Project – Data Structures & Algorithms Focus: Real-world implementation of core CS concepts using Java