Library Management System

Overview

• A lightweight, menu-driven Java console application designed to manage physical books and ebooks. The project demonstrates object-oriented programming, collections, interfaces, inheritance, custom utilities, and multithreading concepts all implemented in a clean, modular structure.
• This project simulates a library management system with features such as adding books, issuing and returning books, searching, sorting, and background notifications.
• It supports both physical books and ebooks, while maintaining clean separation of concerns via classes, interfaces, and utility components.
• The application runs entirely in the console.

Concepts Applied

This project applies core Java concepts, including:

1. Programming Fundamentals

   • Variables & data types
   • Arithmetic operators (issued vs remaining book count)
   • Conditional statements (if, switch)
   • Loops (for-each loops for displaying collections)

2. Object-Oriented Programming

   • Classes & Objects
   • Interfaces (Borrowable)
   • Inheritance (Book EBook)
   • Encapsulation (private fields + getters/setters)
   • Method overriding
   • Static members (tracking totals)

3. Collections & Streams

   • HashMap for fast ID-based lookup
   • Stream filtering for search
   • Stream sorting with comparators
   • Lambdas (forEach, filtering expressions)

4. Exception Handling

   • Input mismatch handling for integers/doubles
   • Validation for string inputs

5. Multithreading

   • Background notification thread (NotificationUtils)
   • Conditional notification behavior
   • Demonstrates concurrent execution

Project structure

.
|-- Book.java
|-- Borrowable.java
|-- EBook.java
|-- Library.java
|-- LibraryApp.java
`-- utils
    |-- InputUtils.java
    |-- MenuDecoratorUtils.java
    `-- NotificationUtils.java

1 directory, 8 files

Installation & Setup

1. Prerequisites

   • Java 25
   • Any IDE or terminal java commands

2. Clone the repository

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

3. Navigate to the project folder

   cd library-management-system

4. Run the app

    java LibraryApp.java

Video

• See how the Library Management System works in this video walkthrough.

License

• MIT License: See License file for details.