Library Management System

A comprehensive command-line interface (CLI) library management system built in Java. This system provides separate interfaces for librarians, professors, and students with role-based access control and complete book management functionality.

Features

🔐 Role-Based Access Control

• Librarian System: Full administrative access to manage books
• Professor System: Book borrowing with higher limits and profile management
• Student System: Book borrowing with standard limits and profile management

📚 Book Management

• Add new books with comprehensive details (title, author, ISBN, genre, publication year, quantity, language, pages)
• Delete books from the library database
• Update existing book information
• Display all books in the library
• Advanced search functionality (by title, genre, ISBN, author)

📖 Borrowing System

• Book borrowing with quantity tracking
• Book return functionality
• Role-based borrowing limits (different limits for students and professors)
• Real-time borrowing limit tracking

🔍 Search & Discovery

• Search books by multiple criteria
• User-friendly search interface
• Detailed book information display

👤 User Profile Management

• Account information display
• Profile update functionality
• Borrowing history tracking

System Architecture

The system is built with object-oriented principles and includes:

• LibraryManagementSystem: Main controller class
• LibraryDatabase: Database management for books
• Librarian: Administrative functions
• Student: Student-specific operations with borrowing limits
• Professor: Professor-specific operations with extended privileges
• Book: Book entity with comprehensive attributes
• Search: Advanced search functionality
• BookLender: Interface for borrowing operations

Prerequisites

• Java Development Kit (JDK) 8 or higher

Installation

1. Clone the repository:

git clone https://github.com/username/library-management-system.git
cd library-management-system

2. Compile the Java files:

javac -d bin src/system/*.java

3. Run the application:

java -cp bin system.LibraryManagementSystem

Usage

Starting the Application

When you run the application, you'll see the main menu:

------------------------------------
            LIBRARY SYSTEM          
------------------------------------
1. Librarian Subsystem
2. Professor Subsystem
3. Student Subsystem
4. Exit

Enter your choice: 

Librarian Functions

Access the librarian system to:

1. Add Book: Enter comprehensive book details including:

   • Title (must be unique)
   • Author (alphabetic characters only)
   • ISBN (unique numeric identifier)
   • Genre (alphabetic characters only)
   • Publication Year
   • Book Quantity
   • Language
   • Number of Pages

2. Delete Book: Remove books using ISBN

3. Update Book: Modify existing book information

4. Display All Books: View complete library inventory

Professor/Student Functions

Both user types can:

1. Show Account Info: Display user profile and borrowing information
2. Borrow Book:
   • View available books
   • Select book by ISBN
   • System checks borrowing limits and book availability
3. Return Book:
   • View borrowed books
   • Return book by ISBN
   • Updates library inventory automatically
4. Profile Update: Modify user information
5. Search Book: Use advanced search by title, genre, ISBN, or author

Example: Adding a Book

Enter book details:
Title: The Great Gatsby
Author: F Scott Fitzgerald
ISBN: 9780743273565
Genre: Fiction
Publication Year: 1925
Book Quantity: 5
Language: English
Pages: 180

Example: Borrowing a Book

Available Books:
[Book list displays]

Enter Book ISBN: 9780743273565
Book Borrowed!
Remaining borrowing limit as a student: 4

Data Validation

The system includes comprehensive input validation:

• Duplicate Prevention: No duplicate titles or ISBNs allowed
• Format Validation: Author, genre, and language must contain only alphabetic characters
• Numeric Validation: ISBN, publication year, quantity, and pages must be positive integers
• Empty Field Prevention: All required fields must be filled

Borrowing Limits

• Students: Limited number of books (configurable via librarian settings)
• Professors: Higher borrowing limits than students
• Real-time Tracking: System displays remaining borrowing capacity

Search Functionality

The system provides multiple search options:

1. Search by Title: Find books with matching titles
2. Search by Genre: Browse books by category
3. Search by ISBN: Direct book lookup
4. Search by Author: Find all books by a specific author

Error Handling

• Book not found scenarios
• Insufficient quantity warnings
• Borrowing limit enforcement

Project Structure

library-management-system/
├── src/
│   └── system/
│       ├── LibraryManagementSystem.java    # Main application class
│       ├── LibraryDatabase.java            # Database management
│       ├── Librarian.java                  # Librarian operations
│       ├── Student.java                    # Student operations
│       ├── Professor.java                  # Professor operations
│       ├── Book.java                       # Book entity
│       ├── User.java                       # Manage Users operations and constraints
│       ├── Search.java                     # Search functionality
│       └── BookLender.java                 # Borrowing interface
├── bin/                                    # Compiled classes
└── README.md

Future Enhancements

• Due date tracking and overdue notifications
• Book reservation system
• Fine calculation for overdue books
• Export/import functionality for book data
• GUI version of the application
• User authentication system
• Book recommendation system

Known Issues

• Data is not persisted between application runs (in-memory storage)
• No user authentication - role selection is based on menu choice