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Core Java OOP Practice 🚀

Java OOP Status

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.

🎯 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

🧠 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

📁 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.

📊 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

📌 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

🧩 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

🛠 Tech Stack

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

▶️ 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

👨‍💻 Author

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

⭐ 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.

Happy Coding ☕