Detailed Java 🧠☕

A beginner-friendly, educational Java programming repository — designed to explain OOP concepts, strengthen fundamentals, and prepare for interviews & academic courses.

👩‍💻 Created by Sakiba Belal
🎓 Department of Software Engineering, NSTU

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📚 About This Repository

This repository contains detailed Java programs and class-based examples with clear explanations. It's designed for:

• 🧒 Beginners just starting with Java
• 👩‍🎓 University students (e.g. NSTU) following a structured course
• 🧠 Self-learners revising Object-Oriented Programming
• 💼 Interview preparation for Java-based roles

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💡 Topics Covered

Each topic is implemented inside the src/ directory with clean code and helpful comments. Topics include:

• ✅ Java syntax & basic programs
• ✅ Object-Oriented Programming (OOP)
  • Classes & Objects
  • Inheritance
  • Polymorphism
  • Abstraction & Interfaces
  • Encapsulation
• ✅ Arrays and collections
• ✅ File I/O basics
• ✅ Recursion and algorithm examples
• ✅ Real-world Java examples

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🗂️ Example Folder Structure

DetailedJava/
├── src/
│   ├── basics/
│   ├── oop/
│   │   ├── inheritance/
│   │   ├── polymorphism/
│   ├── recursion/
│   └── fileio/
├── README.md
└── ...

💡 You can explore or organize files by topic inside the src/ directory.

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💻 How to Run

You can open this project using any Java IDE such as Eclipse, IntelliJ IDEA, or NetBeans.

👉 Option 1: Using IntelliJ or Eclipse

1. Clone this repo
2. Import as Java project
3. Browse to /src folder
4. Run individual files containing public static void main(String[] args)

👉 Option 2: Using Terminal (JDK Installed)

cd src
javac oop/inheritance/Animal.java
java oop.inheritance.Animal

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🧠 Sample Code (OOP - Inheritance)

// Animal.java
public class Animal {
    void sound() {
        System.out.println("Animal makes a sound");
    }
}

// Dog.java
public class Dog extends Animal {
    void sound() {
        System.out.println("Dog barks");
    }

    public static void main(String[] args) {
        Dog d = new Dog();
        d.sound(); // Output: Dog barks
    }
}

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🎯 Learning Objectives

• Build a strong foundation in Java
• Understand core OOP principles and how Java implements them
• Prepare for university courses and practical lab exams
• Get ready for technical interviews with hands-on examples

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💬 Feedback

This project is made with ❤️ to help fellow learners. Feel free to open an issue or connect with me if you find it helpful or have suggestions.

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