Java OOP Fundamentals

Welcome to the Java OOP Fundamentals! 🎉 This repository is designed for beginners who want to learn the fundamentals of Object-Oriented Programming (OOP) in Java.

📝 What You'll Learn

• Encapsulation: How to protect data and expose behavior.
• Inheritance: Building relationships between classes.
• Polymorphism: Achieving flexibility with interfaces and overridden methods.
• Abstraction: Defining contracts and shared behavior using abstract classes.

📂 Project Structure

src/com/starterkit/
├── abstraction/
│   ├── Employee.java
│   ├── SalariedEmployee.java
│   └── AbstractionDemo.java
├── encapsulation/
│   ├── BankAccount.java
│   └── EncapsulationDemo.java
├── inheritance/
│   ├── Animal.java
│   ├── Dog.java
│   └── InheritanceDemo.java
└── polymorphism/
    ├── Shape.java
    ├── Circle.java
    ├── Rectangle.java
    └── PolymorphismDemo.java

🚀 How to Use

1. Clone this repository:

   git clone https://github.com/LamaBimal/Java-OOP-StarterKit.git
   cd Java-OOP-StarterKit

2. Compile all Java files:

   mkdir -p out
   javac -d out $(find src -name "*.java")

3. Run any demo class:

   java -cp out com.starterkit.encapsulation.EncapsulationDemo
   java -cp out com.starterkit.inheritance.InheritanceDemo
   java -cp out com.starterkit.polymorphism.PolymorphismDemo
   java -cp out com.starterkit.abstraction.AbstractionDemo

🎯 Suggested Learning Path

1. Start with encapsulation/BankAccount.java to understand private state and controlled mutation.
2. Move to inheritance/Animal.java and inheritance/Dog.java for parent-child relationships.
3. Continue with polymorphism/Shape.java and implementations to see one interface, multiple behaviors.
4. Finish with abstraction/Employee.java to learn abstract class contracts.

🤝 Contributing

Feel free to fork this repo, add your own OOP examples, and open a pull request.