Java OOP Interfaces, Abstraction & Class Relationships

🚀 Master OOP with Real‑World Java Implementations

This repository demonstrates essential Object‑Oriented Programming (OOP) concepts including
encapsulation, abstraction, interfaces, and class relationships through two real-world tasks:

1. Library Management System
2. Taxable Interface: Employee & Product Tax Calculation

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📁 Project Structure

java-oop-interfaces-abstraction/
│
├── .github/workflows/
│   └── java-build.yml
│
├── screenshots/
│   ├── 1.a.png
│   ├── 1.b.png
│   ├── 1.c.png
│   ├── 1.d.png
│   └── 2.png
│
├── src/
│   ├── Book.java
│   ├── BookManagementSystem.java
│   ├── Employee.java
│   ├── Library.java
│   ├── Main.java
│   ├── Product.java
│   └── Taxable.java
│
├── LICENSE
└── README.md

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📘 Task 1 — Library Management System

Book Class

Represents:

• bookID
• title
• author
• isAvailable

Library Class

Provides:

• ➕ Add books
• ➖ Remove books
• 🔍 Search by ID
• 📋 Display all books

📸 Screenshots (Task 1)

1.a	1.b

1.c	1.d

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🧮 Task 2 — Taxable Interface Implementation

Taxable Interface

Defines:

• salesTax = 0.07
• incomeTax = 0.105
• Method: calcTax()

Employee Class

✔ Calculates income tax from salary.

Product Class

✔ Calculates sales tax from price.

📸 Screenshot (Task 2)

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▶️ How to Run

Clone Repository

git clone https://github.com/TheComputationalCore/java-oop-interfaces-abstraction.git

Navigate

cd java-oop-interfaces-abstraction/src

Compile

javac *.java

Run Task 1

java Library

Run Task 2

java Main

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🛠 Requirements

• Java JDK 8+
• Terminal / Command Prompt / IDE (IntelliJ, VS Code, Eclipse)

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📝 License

Licensed under the MIT License.