Library Management System – Low-Level Design (LLD)

Overview

This project is a simple Library Management System designed using Low-Level Design (LLD) principles. It models basic real-world library operations such as adding books, registering members, issuing and returning books.

Problem Statement

Design and implement a Library Management System that:

• Manages books and members
• Issues and returns books
• Tracks book availability
• Prevents issuing unavailable books

Design Approach

The system follows Object-Oriented Programming (OOP) and SOLID principles:

• Each class has a single responsibility
• Business logic is separated from data models
• The design is easy to extend

Key Classes

• Book: Represents a book in the library
• Member: Represents a library member
• Library: Acts as a repository for books and members
• IssueService: Handles issuing and returning of books
• BookStatus: Enum for book availability

How to Run

1. Clone the repository
2. Open in any Java IDE (IntelliJ / Eclipse / VS Code)
3. Compile and run Main.java

Technologies Used

• Java
• OOP & SOLID principles

Author

Ceija