Java OOP Learning

This repository contains a complete collection of Object-Oriented Programming (OOP) concepts in Java. Each concept is explained with clear, beginner-friendly, and well-structured code examples.

The repo is organized into folders for easy navigation, making it useful for:

• 📚 Students learning Java OOP
• 🔄 Quick revision before exams or interviews
• 👩‍💻 Developers brushing up OOP fundamentals

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📂 Repository Structure

Java-OOP-Learning/src/
├── _01_Basics/                        # Classes, Objects, Constructors
├── _02_Static_Concepts/               # Static Variables, Methods, Blocks, vs Non-static, Singleton Class
├── _03_Encapsulation/                 # Encapsulation, Access Modifiers, Getters & Setters, final variables, Immutability
├── _04_Abstraction_And_Interfaces/    # Abstract Class, Interface, Default & Static methods, Extended & Nested Interfaces, Diamond Problem
├── _05_Inheritance/                   # Types, Constructor Chaining, super &  final Keywords, Relationships
├── _06_Polymorphism/                  # Compile-time (Overloading), Runtime (Overriding), Down-cating, Dynamic Object Creation
├── _07_Inner_Classes/                 # Anonymous, Local, Member, Static Inner Classes
├── _08_Built_In_Classes/              # String, StringBuilder, Wrapper Classes, Object, Math, etc.
├── _09_Built_In_Interfaces/           # Comparable, Comparator, Cloneable, Runnable, Iterator, etc.
└── README.md

🚀 Key Features

• Organize concepts into folders by pillars for clear navigation.
• Highlight Java-specific behavior for concepts like multiple inheritance, diamond problem, final/immutable classes, and dynamic method dispatch.
• Cover advanced topics like built-in classes, interfaces, generics, annotations, exception handling, and design patterns like Singleton.

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🎯 Goals of this Repo

• Provide a structured, step-by-step exploration of Java OOP concepts from basics to advanced.
• Serve as a personal reference and revision resource for learners.
• Offer beginner-friendly, clean, and well-commented code for easy understanding.

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▶️ How to Run the Code

1. Clone this repository:

git clone https://github.com/nabeerah27/Java-OOP-Learning.git

2. Open the project in IntelliJ IDEA or any Java IDE.
3. Navigate to the folder of the concept you want to run.
4. Compile and run the .java files.

Note: Each .java file contains its own main method for easy execution.

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📝 License

This code is available under the MIT License — check LICENSE for more info.

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💡 Contributions

• 🛠️ Feel free to contribute with examples, improvements, or enhancements.
• 🌐 Spread the word and share this repo with anyone who might find it useful.

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🔗 Let’s Connect