Core Java OOP Practice 🚀

A clean, focused collection of Core Java console-based implementations designed to demonstrate Object-Oriented Programming (OOP) and essential Core Java fundamentals.

Each project is intentionally named based on the exact concept it implements, making this repository a clear, reliable reference for Core Java revision and interview preparation.

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🎯 Purpose of This Repository

• Strengthen Core Java and OOP fundamentals through focused examples
• Understand how and why each concept works in isolation
• Provide a structured reference for interview preparation
• Reinforce language fundamentals required for scalable Java applications

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🧠 Core Concepts Covered

• Arrays & Matrices
• Classes & Objects
• Constructors (default & parameterized)
• Encapsulation (getters & setters)
• Inheritance & super keyword
• Method Overloading & Overriding
• Abstract Classes & Interfaces
• Runtime Polymorphism
• Composition (Has-A relationship)
• Exception Handling
• Strings (String, StringBuilder, StringBuffer)
• Collections Framework
• Threading And Multithreading
• Menu-driven console applications

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📁 Repository Structure

Core-Java-OOP-Practice
│
├── AbstractClassMethodOverridingDemo
├── AutomobileInterfacePolymorphismDemo
├── BankAccountOOPConsoleDemo
├── CollectionFrameWorkDemos
├── CoreJavaPractice
├── CustomerBillingSystemUsingComposition
├── CustomerProductAddressDemo
├── EncapsulationConstructorDemo
├── ExceptionHandlingDemo
├── InheritanceAndSuperKeywordDemo
├── InterfacePolymorphismDemo
├── LambdaExpressionAndFunctionalInterfaceDemo
├── MethodOverloadingStaticVarargsWrapperDemo
├── StringStringBuilderStringBufferDemo
├── ThreadingDemo
└── README.md

Each folder represents an independent Core Java module and can be imported individually into an IDE.

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📊 Projects Overview

🟢 Beginner Level – Core Java Fundamentals

#	Project Folder	Primary Focus
1	CoreJavaPractice	Core Java fundamentals including syntax, control flow, arrays (1D/2D), matrix operations, and command-line arguments
2	StringStringBuilderStringBufferDemo	String immutability and mutable strings
3	EncapsulationConstructorDemo	Encapsulation and constructors
4	MethodOverloadingStaticVarargsWrapperDemo	Overloading, varargs, wrappers
5	ExceptionHandlingDemo	Exception handling

🟡 Intermediate Level – Object-Oriented Programming

#	Project Folder	Primary Focus
6	InheritanceAndSuperKeywordDemo	Inheritance and super
7	AbstractClassMethodOverridingDemo	Abstract classes & overriding
8	InterfacePolymorphismDemo	Interface-based polymorphism
9	AutomobileInterfacePolymorphismDemo	Loose coupling via interfaces
10	CustomerProductAddressDemo	Object relationships
11	CustomerBillingSystemUsingComposition	Composition
12	BankAccountOOPConsoleDemo	Real-world OOP modeling

🔵 Advanced Level – Modern Java & Concurrency

#	Project Folder	Primary Focus
13	CollectionFrameWorkDemos	Collections Framework
14	LambdaExpressionAndFunctionalInterfaceDemo	Lambdas & functional interfaces
15	ThreadingDemo	Multithreading & synchronization

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📌 Design Principles

• One primary concept per project
• Honest, descriptive project naming strictly aligned with implemented concepts
• Clean, readable, and interview-oriented code
• No frameworks — pure Core Java

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🧩 Skills Demonstrated

• Ability to explain Core Java concepts through working code examples
• Object-Oriented Analysis and Design
• Interface-driven development
• Effective use of Java language features
• Exception-safe coding practices
• Understanding of Java object lifecycle and execution basics

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🛠 Tech Stack

• Java (Core Java)
• Eclipse IDE / IntelliJ IDEA
• Git & GitHub

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▶️ How to Run

1. Clone the repository

   git clone https://github.com/CoreJavaPulse/Core-Java-OOP-Practice.git

2. Import any project folder into Eclipse or IntelliJ IDEA as an existing Java project

3. Run the corresponding main class

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👨‍💻 Author

Hitesh Mane
Java Backend Developer
Pune, India 📧 Email: hiteshmane5hm@gmail.com 💻 GitHub: https://github.com/CoreJavaPulse

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⭐ Final Note

This repository emphasizes conceptual clarity and correctness over scale or framework usage. It is intended to serve as a solid Core Java reference for learning, revision, and technical discussions.

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Happy Coding ☕