⚽ Football Player Manager (Doubly Linked List & File I/O)

A comprehensive Command Line Interface (CLI) application that acts as a mini database for football player records. Instead of relying on built-in Java collections, this project implements a custom Doubly Linked List and a custom Stack to manage data efficiently.

🛠️ Core Technologies & Features

1. Custom Doubly Linked List (Auto-Sorting)

• Built from scratch using a custom Node class with prev and next pointers.
• Alphabetical Insertion: Every time a new player is added, the list traverses and automatically inserts the node in the correct alphabetical order based on Name (and Surname for duplicates).
• Bidirectional Traversal: Capable of printing the database from A-Z (using head) and Z-A (using tail).

2. File I/O (Data Persistence)

• Reading: Parses data from players.txt, securely handling string splitting and date conversions using a custom Date class.
• Writing: Saves the current state of the linked list back into a text file (players_temp.txt) before exiting, ensuring no data loss.

3. Custom Stack Implementation

• Includes a utility to deep-copy the current linked list into a custom Stack architecture, demonstrating LIFO (Last-In-First-Out) operations by popping and printing the records.

4. Full CRUD Operations

• Create: Add new players via console.
• Read: Search and print specific players by name/surname.
• Update/Sort: Maintains sorted state automatically.
• Delete: Securely removes nodes by re-linking prev and next pointers.

🚀 How to Run

1. Compile the package: javac application/*.java
2. Run the main app: java application.Application
3. Follow the interactive menu to load files, add records, or traverse the list.