☕ Object-Oriented Programming with Java

A structured collection of Java programs built while learning the fundamentals of Object-Oriented Programming.

"Learning Java, one concept at a time."

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📖 About

This repository documents my journey of learning Object-Oriented Programming (OOP) using Java.

Instead of only studying theory, I implemented each concept through small, focused Java programs. Every folder represents a different OOP topic, helping me build a strong foundation before moving on to larger Java applications.

One program was completed and committed every day for 12 consecutive days, reflecting consistency, discipline, and continuous learning.

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🎯 Learning Goals

• Learn Java Object-Oriented Programming from fundamentals
• Understand how classes interact in real-world applications
• Write clean, modular, and reusable Java code
• Build strong programming habits through consistent daily practice
• Prepare for advanced Java, DSA, and backend development

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🧠 OOP Concepts Covered

Concept	Status
Classes & Objects	✅
Constructors	✅
Constructor Overloading	✅
Encapsulation	✅
Inheritance	✅
Polymorphism	✅
Abstraction	✅

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📂 Repository Structure

OOPs-With-Java/
│
├── Q01_Student_Teacher/
│
├── Q02_Bank_Account_System/
│
├── Q03_Mobile_Specification/
│
├── Q04_Employee_Management_System/
│
├── Q05_ATM_Machine/
│
├── Q06_Product_Price/
│
├── Q07_Vehicle_System/
│
├── Q08_University_System/
│
├── Q09_Method_Overloading/
│
├── Q10_Method_Overriding/
│
├── Q11_Payment_Gateway/
│
├── Q12_Shape_Area_Calculator/
│
├── assets/
│
└── README.md

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📚 Programs Included

Day	Program	Concept
Day 1	Student Teacher System	Classes & Objects
Day 2	Bank Account System	Classes & Objects
Day 3	Mobile Specification	Constructors
Day 4	Employee Management System	Constructor Overloading
Day 5	ATM Machine	Encapsulation
Day 6	Product Price	Encapsulation & Validation
Day 7	Vehicle System	Inheritance
Day 8	University System	Inheritance
Day 9	Method Overloading	Compile-Time Polymorphism
Day 10	Method Overriding	Runtime Polymorphism
Day 11	Payment Gateway	Abstraction
Day 12	Shape Area Calculator	Abstraction

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🚀 Key Takeaways

Through these programs I practiced:

• Creating and using Java classes and objects
• Designing modular and reusable code
• Applying all four pillars of OOP
• Constructor overloading and method overloading
• Runtime and compile-time polymorphism
• Building clean project structures
• Developing consistency through daily coding

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💻 Technologies Used

Technology	Purpose
Java	Programming Language
OOP	Software Design Principles
Git	Version Control
GitHub	Code Hosting & Version Management

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▶️ Getting Started

Clone the repository

git clone https://github.com/selenophile3582/OOPs-With_Java.git

Move into the project

cd OOPs-With_Java

Open any program folder in your preferred IDE (VS Code, IntelliJ IDEA, or Eclipse) and run the corresponding Main.java file.

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📈 Learning Journey

This repository represents 12 consecutive days of Java practice.

Rather than solving random problems, I focused on learning one Object-Oriented Programming concept each day, implementing it in Java, and maintaining consistency through daily GitHub commits.

This repository reflects both my technical growth and my commitment to continuous learning.

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🛣️ Roadmap

• ✅ Classes & Objects
• ✅ Constructors
• ✅ Encapsulation
• ✅ Inheritance
• ✅ Polymorphism
• ✅ Abstraction
• ⏳ Java Collections Framework
• ⏳ Exception Handling
• ⏳ File Handling
• ⏳ Mini Projects
• ⏳ Advanced Java

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🤝 Connect With Me

Dhiraj Kumar

GitHub:

https://github.com/selenophile3582

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🌱 Learning never stops.

"Every expert was once a beginner who chose to stay consistent."