🚀 Java Mini Projects

21 Practical Java Projects built using Core Java, OOP, Collections Framework & File Handling

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🚀 Java Mini Projects

A collection of 21 Java Mini Projects built to strengthen Core Java, Object-Oriented Programming (OOP), Collections Framework, File Handling, and Problem-Solving Skills.

This repository is part of my 21-Day Java Learning Challenge, where I built one Java project every day while preparing for Software Development Engineer (SDE-1) interviews.

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📑 Table of Contents

• 🎯 Goals
• 🛠️ Technologies Used
• 📂 Repository Structure
• 📅 21-Day Progress Tracker
• 🌟 Featured Projects
• 📸 Project Screenshots
• 📚 Java Concepts Covered
• 🎓 Skills Gained
• 🚀 Getting Started
• 📈 Learning Outcomes
• 🌟 About This Repository
• 👨‍💻 Author
• ⭐ Support

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🎯 Goals

• Master Core Java
• Build strong Object-Oriented Programming (OOP) fundamentals
• Practice Java Collections Framework
• Learn File Handling
• Improve Problem-Solving Skills
• Follow Git & GitHub Best Practices
• Build a Professional Java Portfolio

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🛠️ Technologies Used

• ☕ Java
• 💻 VS Code
• 🌿 Git
• 🐙 GitHub

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📂 Repository Structure

Java-Mini-Projects
│
├── assets
├── .gitignore
├── LICENSE
├── README.md
│
├── 01-Calculator-App
├── 02-Student-Management-System
├── 03-Bank-Management-System
├── 04-Number-Guessing-Game
├── 05-Contact-Management-System
├── 06-Library-Management-System
├── 07-To-Do-List-Manager
├── 08-Quiz-Application
├── 09-Expense-Tracker
├── 10-ATM-Simulation
├── 11-Movie-Ticket-Booking-System
├── 12-Inventory-Management-System
├── 13-Hotel-Reservation-System
├── 14-File-Based-Student-Management-System
├── 15-Notes-Manager
├── 16-Password-Generator
├── 17-Voting-System
├── 18-Online-Shopping-Cart
├── 19-Parking-Lot-Management-System
├── 20-Employee-Payroll-System
└── 21-Mini-E-Commerce-Console-App

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📅 21-Day Progress Tracker

Day	Project	Status
✅ Day 1	Calculator App	Completed
✅ Day 2	Student Management System	Completed
✅ Day 3	Bank Management System	Completed
✅ Day 4	Number Guessing Game	Completed
✅ Day 5	Contact Management System	Completed
✅ Day 6	Library Management System	Completed
✅ Day 7	To-Do List Manager	Completed
✅ Day 8	Quiz Application	Completed
✅ Day 9	Expense Tracker	Completed
✅ Day 10	ATM Simulation	Completed
✅ Day 11	Movie Ticket Booking System	Completed
✅ Day 12	Inventory Management System	Completed
✅ Day 13	Hotel Reservation System	Completed
✅ Day 14	File-Based Student Management System	Completed
✅ Day 15	Notes Manager	Completed
✅ Day 16	Password Generator	Completed
✅ Day 17	Voting System	Completed
✅ Day 18	Online Shopping Cart	Completed
✅ Day 19	Parking Lot Management System	Completed
✅ Day 20	Employee Payroll System	Completed
✅ Day 21	Mini E-Commerce Console App	Completed

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🌟 Featured Projects

Project	Description
🛒 Mini E-Commerce Console App	Shopping cart, billing, file handling and order history
👨‍💼 Employee Payroll System	Employee management with salary & bonus calculation
🅿️ Parking Lot Management System	Vehicle parking slot allocation system
🛍️ Online Shopping Cart	Product management and billing
📄 File-Based Student Management System	CRUD operations using Java File Handling

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📸 Project Screenshots

🧮 Calculator App

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📚 Library Management System

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📄 File-Based Student Management System

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🛒 Online Shopping Cart

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🅿️ Parking Lot Management System

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👨‍💼 Employee Payroll System

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🛍️ Mini E-Commerce Console App

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📚 Java Concepts Covered

• Variables & Data Types
• Operators
• Control Statements
• Methods
• Classes & Objects
• Constructors
• Encapsulation
• Inheritance
• Polymorphism
• Abstraction
• Collections Framework
• Exception Handling
• File Handling
• Menu-Driven Applications
• Object-Oriented Design

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🎓 Skills Gained

• ☕ Core Java
• 📦 Object-Oriented Programming (OOP)
• 📚 Collections Framework
• 💾 File Handling
• ⚠️ Exception Handling
• 🔄 CRUD Operations
• 🧠 Business Logic Implementation
• 🔍 Searching & Validation
• 📊 Data Management
• 🌿 Git & GitHub
• 🖥️ Console Application Development

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🚀 Getting Started

Clone this repository:

git clone https://github.com/kadirisaikumar3/Java-Mini-Projects.git

Navigate into the repository:

cd Java-Mini-Projects

Open any project folder and compile:

javac FileName.java
java FileName

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📈 Learning Outcomes

By completing these 21 Java Mini Projects, I strengthened my understanding of:

• Core Java Programming
• Object-Oriented Programming (OOP)
• Java Collections Framework
• File Handling
• Exception Handling
• Business Logic Development
• CRUD Operations
• Menu-Driven Application Development
• Git & GitHub Workflow
• Clean Code Practices

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🌟 About This Repository

This repository documents my journey of building 21 Java console applications from beginner to intermediate level.

Every project was designed to improve software development fundamentals, problem-solving ability, and practical Java programming skills while preparing for Software Development Engineer (SDE-1) interviews.

The repository demonstrates consistent daily coding, clean project organization, documentation, and version control using Git and GitHub.

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📊 Repository Statistics

Metric	Value
📁 Total Projects	21
☕ Programming Language	Java
📄 README Files	22
💻 Console Applications	21
🗓️ Challenge Duration	21 Days
✅ Completion	100%

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👨‍💻 Author

Sai Kumar

Aspiring Software Engineer | Java Developer | Google SDE-1 Preparation

🌐 Connect with Me

• GitHub: https://github.com/kadirisaikumar3
• LinkedIn: https://www.linkedin.com/in/saikumarkadiri/

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⭐ Support

If you found this repository helpful, please consider giving it a ⭐.

Your support motivates me to continue building high-quality Java projects and sharing my learning journey with the developer community.

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📜 License

This project is licensed under the MIT License.

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⭐ Thank You for Visiting! ⭐

If you like this repository, don't forget to Star ⭐ it.

Happy Coding! 🚀