README.md

City Library Digital Management System

A Java-based console application for managing books, members, and library transactions using File Handling and the Java Collections Framework.

This project is created as part of Java Programming – Assignment 4 (B.Tech / BCA / BSc, Semester 3).

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Features Book Management

• Add new books
• Auto-generate unique Book IDs
• Issue and return books
• Search books by:
  • ID
  • Title
  • Author
  • Category
• Sort books:
  • By title (Comparable)
  • By author (Comparator)

🧑‍🤝‍🧑 Member Management

• Add new members
• Auto-generate unique Member IDs
• Track issued books

💾 File Handling

• Persistent storage using:
  • books.txt
  • members.txt
• Uses:
  • FileReader, FileWriter
  • BufferedReader, BufferedWriter

🗂 Java Collections Used

• Map<Integer, Book> for books
• Map<Integer, Member> for members
• List<Integer> for issued books
• Set<String> for unique categories
• Comparator for custom sorting

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📂 Project Structure