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Java Learning Hub - Complete Guide for Beginners & Beyond

Welcome to a comprehensive Java learning repository designed for juniors and beginners who want to master Java without learning 100 new things at once. This hub provides a structured pathway from basics to advanced topics like Spring Boot, DSA, and AI/Agents with Java.

What You'll Learn

1. Java Basics

  • Variables, Data Types, Operators
  • Control Flow (if-else, loops, switch)
  • Methods & Functions
  • Arrays & Collections (List, Map, Set)
  • Exception Handling

2. Object-Oriented Programming (OOP)

  • Classes & Objects
  • Inheritance, Polymorphism
  • Encapsulation & Abstraction
  • Access Modifiers
  • Interfaces & Abstract Classes
  • Static & Inner Classes

3. Data Structures & Algorithms (DSA)

  • Arrays, Linked Lists, Stacks, Queues
  • Trees (Binary, BST, Balanced Trees)
  • Graphs & Graph Algorithms
  • Sorting & Searching Algorithms
  • Dynamic Programming
  • Each topic includes LeetCode links for practice

4. Java Backend Development

  • Spring Boot Fundamentals
  • REST APIs
  • Database Integration (JPA, Hibernate)
  • Application Structure
  • Best Practices

5. Master AI & Agentic AI

  • Introduction to AI in Java
  • LangChain4j Guide (RAG, Agents, Tools)
  • Agentscope Tutorial
  • Multi-Agent Architectures
  • Practical Examples (Document Retrieval, Code Generation)

How to Use This Repository

For Self-Learning:

  1. Start with Java Basics - Master fundamentals first
  2. Move to OOP - Build strong OOP concepts
  3. Practice DSA - Enhance problem-solving skills
  4. Explore Java Backend - Build real applications
  5. Dive into Master AI - Learn cutting-edge AI integration

For Mentors/Contributors:

  1. See CONTRIBUTING.md for guidelines
  2. Add new lessons, examples, or DSA problems
  3. Update LeetCode links and difficulty tags

Directory Structure

OOPS/
├── docs/                          # GitHub Pages content
│   ├── index.html                # Homepage
│   ├── styles.css                # Styling
│   ├── java-basics/
│   │   ├── index.html
│   │   └── examples/
│   ├── oops/
│   │   ├── index.html
│   │   └── examples/
│   ├── dsa/
│   │   ├── index.html
│   │   ├── problems/
│   │   └── solutions.md
│   ├── java-backend/
│   │   ├── index.html
│   │   └── examples/
│   └── master-ai/
│       ├── index.html
│       ├── langchain4j-guide.md
│       ├── agentscope-guide.md
│       └── examples/
├── Lect1/, Lect2/, ...          # Your existing OOP lessons
├── CONTRIBUTING.md
└── README.md

Quick Start

1. Clone & Setup

git clone https://github.com/yourusername/java-learning-hub.git
cd java-learning-hub

2. Enable GitHub Pages

  • Go to your repository Settings → Pages
  • Select Deploy from a branch
  • Choose main branch and /docs folder
  • Click Save

3. View Your Site

Your site will be live at: https://yourusername.github.io/java-learning-hub

Technologies Used

  • Java 11+ - Programming language
  • Spring Boot - Backend framework
  • LangChain4j - AI/ML framework for Java
  • Agentscope - Multi-agent framework
  • HTML/CSS - Documentation site
  • GitHub Pages - Hosting

Contributing

We welcome contributions from juniors and seniors alike!

To Add a New Lesson:

  1. Create a new .md or .java file in the appropriate folder
  2. Follow the template format (see CONTRIBUTING.md)
  3. Add LeetCode links (for DSA problems)
  4. Submit a PR with description

To Fix/Update:

  1. Fork the repository
  2. Create a branch: git checkout -b fix/description
  3. Make changes and commit
  4. Push and create a PR

Useful Resources

Contact & Support

  • Issues: Use GitHub Issues for questions/bugs
  • Discussions: Start a Discussion thread
  • Feedback: Suggestions welcome!

License

This repository is licensed under the MIT License - see LICENSE file for details.

Happy Learning! Start from Java Basics and progress at your own pace. Remember: Consistency beats intensity!