📚 Library Management System (OOP) - Java

This project is a simple Library Management System developed using Object-Oriented Programming (OOP) in Java as part of Day 3 of the Java Developer Internship at Elevate Labs.

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🗓️ Task 3 - Objectives

• Practice OOP concepts: Abstraction, Inheritance, Polymorphism, Encapsulation
• Implement a system to manage books and users
• Features: Add books, issue and return books
• Toolchain: Java, VS Code, Terminal

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📦 Classes Implemented

🔹 Book

• Fields: ID, Title, Issue Status
• Methods: issue(), returnBook(), isIssued()

🔹 User

• Fields: userId, name

🔹 Library

• Manages a list of books
• Methods: addBook(), showBooks(), issueBook(), returnBook()

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🧪 Sample Output

Welcome to Library Management System

1. View Books

2. Issue Book

3. Return Book

Exit
Choose an option: 1
1 - The Alchemist (Available)
2 - Java Programming (Available)
3 - Data Structures (Available)

Choose an option: 2
Enter Book ID to issue: 2
✅ Book issued successfully.

Choose an option: 1
1 - The Alchemist (Available)
2 - Java Programming (Issued)
3 - Data Structures (Available)

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📂 How to Run

javac Main.java Book.java Library.java User.java
java Main