☕ Complete Java learning resource — structured notes, 100+ interview questions, coding problems, handwritten notes, practice sheets & cheatsheets. Perfect for beginners, job seekers & DSA prep. Free & open-source.

☕ Complete Java Learning Hub

The most organized, beginner-friendly Java resource collection on GitHub.

Notes · Interview Qs · Coding Problems · Handwritten Notes · Practice Sheets · Cheatsheets

⭐ Star this repo if it helped you — it helps more people discover it!

This repository is a one-stop Java resource kit — whether you're a complete beginner, preparing for a job interview, or grinding DSA problems, there's something here for you.

• Data types, Variables & Operators
• Control flow (if/else, switch, loops)
• Arrays & Strings
• Methods & Recursion
• Input/Output (Scanner, BufferedReader)

• Classes & Objects
• Constructors & this keyword
• Inheritance & Method Overriding
• Polymorphism (compile-time & runtime)
• Abstraction & Interfaces
• Encapsulation & Access Modifiers
• static, final, super keywords

• Collections Framework (List, Set, Map, Queue)
• Generics
• Exception Handling (try/catch/finally, custom exceptions)
• Multithreading & Concurrency
• Java 8+ Features (Streams, Lambda, Optional, Functional Interfaces)
• File I/O & Serialization

• Arrays, Linked Lists, Stacks, Queues
• Trees (Binary Tree, BST, AVL)
• Graphs (BFS, DFS, Dijkstra)
• Sorting & Searching Algorithms
• Dynamic Programming
• Recursion & Backtracking

• Top 100 Java interview questions (with answers)
• Tricky output-based questions
• OOP scenario-based questions
• Java 8 interview questions
• Collections & multithreading interview Qs
• HR + Technical round tips

# Clone the repo to your local machine
git clone https://github.com/AdityaChouhan01/java-resources.git

# Navigate into it
cd java-resources

# Open in VS Code
code .

Or just browse the folders directly on GitHub — no setup needed!

• 🎓 Students learning Java for the first time
• 💼 Job seekers preparing for technical interviews (fresher / 1–3 years exp)
• 🧑‍💻 Developers who want a quick cheatsheet or revision material
• 📚 Self-learners following online courses who want supplementary notes
• 🏆 Competitive programmers grinding DSA in Java

• ✅ Handwritten + typed notes — best of both worlds
• ✅ Topic-wise organized — no hunting around
• ✅ Interview-ready Q&A — real questions asked in companies
• ✅ Cheatsheets — print and stick on your wall
• ✅ Free forever — open-source, no paywalls
• ✅ Regularly updated — new content added as I learn

java-resources/
│
├── 📝 notes/
│   ├── 01-java-basics.md
│   ├── 02-oop-concepts.md
│   ├── 03-collections.md
│   ├── 04-java8-features.md
│   └── 05-multithreading.md
│
├── ❓ interview-questions/
│   ├── core-java-interview-qs.md
│   ├── oop-interview-qs.md
│   ├── java8-interview-qs.md
│   └── collections-interview-qs.md
│
├── 💻 coding-questions/
│   ├── arrays/
│   ├── strings/
│   ├── linked-list/
│   ├── trees/
│   └── dynamic-programming/
│
├── ✍️ handwritten-notes/
│   ├── oop-diagrams.pdf
│   └── dsa-handwritten.pdf
│
├── 📋 practice-sheets/
│   ├── week-01-basics.md
│   ├── week-02-oop.md
│   └── week-03-dsa.md
│
└── 📄 cheatsheets/
    ├── java-syntax-cheatsheet.md
    ├── collections-cheatsheet.md
    └── java8-cheatsheet.md

⚠️ Update the folder structure above to match your actual files before pushing!

Found a mistake? Want to add more questions or notes? Contributions are welcome!

1. Fork this repo
2. Create a branch: git checkout -b add-my-notes
3. Commit your changes: git commit -m "Add: topic-wise recursion notes"
4. Push: git push origin add-my-notes
5. Open a Pull Request

If this helped you, let me know! I'm always open to feedback, suggestions, or just a hello.

This repository is licensed under the MIT License — free to use, share, and modify with credit.

If this repo saved you time, give it a ⭐ — it costs nothing and means everything!

Made with ☕ and late nights by Aditya Chouhan