☕ 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

Loading

🟢 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