☕ From Noob to Ninja

A Complete Learning Journey Through 100+ Java Programs

🎯 Mission Accomplished!

This repository chronicles my 100-day journey mastering Java programming from absolute basics to advanced concepts. Every line of code represents dedication, growth, and the pursuit of becoming a skilled Software Development Engineer.

📋 Table of Contents

🧠 What's Inside
📚 Topics Covered
🗂️ Repository Structure
🛠️ Tech Stack
⚙️ Quick Start Guide
🌟 Learning Journey
🎯 Key Achievements
🚀 Next Steps
🤝 For Learners
📬 Connect
📄 License

🧠 What's Inside

📁 100+ Java Programs organized into comprehensive modules

🟢 Core Fundamentals

📝 Variables & Data Types
🔄 Control Structures
🧩 Method Mastery
🗃️ Arrays & Collections

🟡 Object-Oriented

🏗️ Classes & Objects
🧬 Inheritance & Polymorphism
🛡️ Encapsulation
🧱 Abstraction

🔴 Advanced Concepts

⚠️ Exception Handling
📦 Package Management
🔗 Lambda Expressions
🧬 Generics

🎮 Featured Projects

Project	Description	Concepts
🎲 Quiz Game	Interactive console application	Control Flow, Collections
📊 Grade Manager	Student management system	OOP, File I/O
🧮 Calculator	Mathematical operations	Methods, Exception Handling
🏦 Bank Simulator	Real-world application	Advanced OOP, Design Patterns

📚 Topics Covered

🔥 Click to explore all 50+ concepts mastered

🌱 Learning Progression

journey
    title Java Learning Journey
    section Fundamentals
      Hello World     : 5: Day 1
      Variables       : 4: Day 5
      Control Flow    : 3: Day 10
      Arrays         : 4: Day 15
    section OOP
      Classes        : 5: Day 25
      Inheritance    : 4: Day 35
      Polymorphism   : 5: Day 45
    section Advanced
      Exceptions     : 4: Day 65
      Generics       : 5: Day 80
      Lambda         : 5: Day 95

🟢 Fundamentals (Days 1-20) ✅ Variables & Data Types (Primitive & Reference) ✅ Operators (Arithmetic, Logical, Bitwise) ✅ Input/Output Operations ✅ Control Flow (if-else, switch, loops) ✅ Methods & Parameter passing ✅ Arrays (1D, 2D, Jagged)	🟡 Intermediate (Days 21-60) ✅ Object-Oriented Programming Fundamentals ✅ Classes & Objects ✅ Constructors & Method Overloading ✅ Inheritance & super keyword ✅ Polymorphism (Runtime & Compile-time) ✅ Abstract Classes & Interfaces
🟠 Advanced OOP (Days 41-70) ✅ Packages & Access Modifiers ✅ String Manipulation & StringBuilder ✅ Exception Handling & Custom Exceptions ✅ File I/O Operations ✅ Collections Framework Overview	🔴 Expert Level (Days 71-100) ✅ Generics & Type Safety ✅ Collections Framework (List, Set, Map) ✅ Lambda Expressions & Functional Interfaces ✅ Stream API & Method References ✅ Multithreading Basics ✅ Design Patterns (Singleton, Factory)

🗂️ Repository Structure

🔍 Click to explore the complete folder structure

📦 Java-Programs
├── 📁 01_Basic/                     ← 🌟 Start Here!
│   └── 🧪 Practice-Set/
├── 📁 02_DataTypes/                 ← 🎯 Primitives & Objects
├── 📁 03_Variables/                 ← 🔄 Scope & Lifecycle
├── 📁 04_OperatorsAndExpressions/   ← ➕ Mathematical Operations
│   └── 🧠 PracticeProblem/
├── 📁 05_ControlStatement/          ← 🎮 Logic & Flow Control
│   └── 🎲 QuizGame/                 ← Mini Project!
├── 📁 06_Methods/                   ← 🔧 Reusable Code
│   └── 📊 Practice_Project/         ← Grade Manager
├── 📁 07_ArrayAndString/            ← 📝 Data Structures
├── 📁 08_OOPs/                      ← 🏗️ Object-Oriented Basics
│   ├── 🧱 Abstraction/
│   ├── 🛡️ Encapsulation/
│   └── 🚗 Inheritance/
├── 📁 09_ArrayAndString/            ← 📋 Advanced Collections
│   └── 📋 ArrayList/
├── 📁 10_String/                    ← 🧵 Text Processing
├── 📁 11_OOPs/                      ← 🧬 Advanced OOP
│   ├── 👨‍👩‍👧 inheritance/
│   ├── 🧠 OOPs1/
│   ├── 🧬 OOPs2/
│   └── 🧪 OOPs3/
├── 📁 Exception_Handling/           ← ⚠️ Error Management
├── 📁 LambdaExpression/             ← 🔗 Functional Programming
├── 📁 OOPs/Generics/                ← 🧬 Type Safety
└── 📁 SelfQuestions/                ← 🧠 Challenge Yourself!
    └── 🧪 01_BasicQuestions/

🛠️ Tech Stack

💻 Development Environment

Java 24
_OpenJDK

VS Code
_{Java Extension Pack}

Git
_{Version Control}

Windows 11
_{Development Platform}

⚙️ Quick Start Guide

🚀 Get Started in 3 Steps

1️⃣ Clone

git clone https://github.com/Piyush64-bit/Java-Programs.git
cd Java-Programs

2️⃣ Compile

cd 01_Basic
javac HelloWorld.java

3️⃣ Run

java HelloWorld

💡 Pro Tips & Advanced Commands

🎯 Different Scenarios

Single File Programs:

javac FileName.java && java FileName

Package-based Programs:

# Compile from root directory
javac -d . package/path/ClassName.java

# Run with full package name
java package.path.ClassName

Multiple Classes:

# Compile all files in directory
javac *.java

# Run the main class
java MainClassName

🔧 Useful Shortcuts

# Quick compilation for current directory
find . -name "*.java" -exec javac {} +

# Run with custom classpath
java -cp . com.example.MainClass

# Debug mode
java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 MainClass

🌟 Learning Journey

🎯 My Transformation Timeline

🤔 Day 1

"What's a variable?"

_{Starting from scratch}

💡 Day 50

"I understand OOP!"

_{Concepts clicking}

🚀 Day 80

"Lambda expressions!"

_{Advanced features}

🏆 Day 100

"I'm a Java developer!"

_{Mission accomplished}

💪 What This Journey Taught Me:

🧠 Technical Skills:

Problem-solving mindset
Clean code practices
Debugging expertise
Design pattern recognition

🎯 Soft Skills:

Persistence and consistency
Self-directed learning
Documentation importance
Community engagement

🏆 Key Milestones Achieved

🎯 Milestone	📅 Day	💭 Reflection
✅ First "Hello World"	Day 1	The beginning of everything
✅ First working loop	Day 8	Understanding iteration
✅ First custom class	Day 25	OOP breakthrough moment
✅ First inheritance	Day 35	Code reusability unlocked
✅ Exception handling	Day 55	Writing robust code
✅ Lambda expressions	Day 85	Modern Java mastery
✅ 100th program	Day 100	Mission Accomplished!

🎯 Key Achievements

📊 By the Numbers

100+

Programs
_{Written & Tested}

50+

Concepts
_Mastered

100

Days
_{Dedicated Learning}

5000+

Lines
_{Of Code}

15+

Projects
_Completed

🌟 Standout Programs & Projects

🎮 Interactive Quiz Game

Features: Multiple choice questions, scoring system, difficulty levels
Concepts: Control flow, collections, user input validation
Lines: 200+ lines of well-structured code

📊 Student Grade Manager

Features: CRUD operations, file persistence, grade calculations
Concepts: OOP design, file I/O, exception handling
Lines: 300+ lines with comprehensive error handling

🧮 Advanced Calculator

Features: Scientific operations, expression parsing, history
Concepts: Method overloading, static methods, string manipulation
Lines: 250+ lines with modular design

🏦 Bank Account Simulator

Features: Multiple account types, transactions, interest calculation
Concepts: Inheritance, polymorphism, encapsulation
Lines: 400+ lines demonstrating real-world OOP

🚀 Next Steps

🎯 Ready for the Next Challenge?

🌟 Advanced Java Journey Continues!

Having mastered the fundamentals, it's time to dive into enterprise-level Java development! The journey doesn't stop here—it evolves.

What's Next:

🌐 Web Development with Spring Framework
🗄️ Database Integration with Hibernate & JPA
🔗 RESTful APIs and Microservices
🧪 Testing with JUnit & Mockito
🏗️ Enterprise Patterns and Architecture
☁️ Cloud Deployment and DevOps

📚 Continue Learning

🚀 Explore Advanced Concepts:

Spring Boot Applications
RESTful Web Services
Database Operations
Security Implementation
Testing Frameworks

🔗 Start Advanced Java Journey →

🎮 Learning Path Progression

📚 Core Java (✅ COMPLETED)
       ↓
🌐 Advanced Java (🚀 IN PROGRESS)
       ↓
☁️ Full Stack Development (🔜 COMING SOON)

🤝 For Learners

🎓 This Repository is Perfect For:

📚 Beginners

Starting their Java journey from scratch

_{Zero to Hero path}

🔄 Intermediate

Reviewing and strengthening core concepts

_{Skill reinforcement}

🎯 Students

Preparing for interviews or exams

_{Academic excellence}

👨‍💻 Self-learners

Who prefer learning by example

_{Hands-on approach}

🌟 How to Use This Repository:

📖 Learning Path

Start with Basics - Follow numbered folders sequentially
Practice Along - Don't just read, code along!
Modify & Experiment - Change code and observe results
Challenge Yourself - Solve problems before looking at solutions

🚀 Contribution Guidelines

🐛 Found a bug? Open an issue with details
💡 Have a better solution? Submit a pull request
📝 Want to add documentation? We'd love that!
⭐ Found it helpful? Give it a star!

📬 Connect

🤝 Let's Connect & Build Together!

GitHub
_{Follow my journey}

LinkedIn
_{Professional network}

Piyush64-bit/Java-Programs