Library Management System (Java)

This project is a modular, object-oriented Library Management System built using Java. It follows the SOLID design principles and applies key design patterns such as Strategy, Factory, and Builder. The system supports extensibility, maintainability, and clarity in architecture.

Features

• Book management (add, update, search)
• Patron management (register, update, track borrowing)
• Book checkout and return process
• Multiple borrowing strategies based on patron types (Student, Guest, Faculty)
• Designed using clear service interfaces and model separation

Project Structure

src/ ├── BorrowingStrategies/ # Strategy pattern implementations
├── Enums/ # Enum definitions (BookStatus, PatronType)
├── Exceptions/ # Custom exceptions (e.g., MaxBorrowingLimitReached)
├── Interfaces/ # Interfaces for services and strategies
├── Models/ # Domain models (Book, Patron, etc.)
├── Services/ # Implementations of services
└── Main.java # Entry point

UML Class Diagram

Below is a high-level class diagram showing the relationship between core components of the system:

Notes:

• Interfaces (e.g., IBookService, ILendingService) ensure abstraction and decoupling.
• Patron uses a BorrowingStrategy to decide borrow limits.
• BorrowingRecord links a Patron and a BookCopy.
• BookCopy references BookMetaInfo.

Design Patterns Used

Pattern	Purpose
Strategy	Implement multiple borrowing rules based on patron type
Factory	Create borrowing records based on input context
Builder	Build BookCopy safely and with flexible parameters

How to Build and Run

1. Clone the repository:

   git clone https://github.com/bharat2002/LibraryManagement.git
   cd LibraryManagement

2. Compile the source code:

   javac -d out src/**/*.java

3. Run the application:

   java -cp out Main

Example Usage

Library library = new Library();
library.addBook("Effective Java", "Joshua Bloch", "ISBN1234", 2008, 3);
library.registerPatron(...);
library.checkoutBook(...);

License

This project is licensed under the MIT License.