Welcome to the Java Junior Roadmap — a complete guide to help you grow from your very first Hello World to a confident Java Developer ready to work with Spring Boot, databases, concurrency, and modern enterprise practices.
This roadmap is designed for self-learners, students, and mentors who want a clear, structured path to learning Java professionally.
It includes theory, practical exercises, and progress checklists for each topic.
Each section can be completed step by step — from basic syntax and object-oriented programming to advanced concepts like asynchronous processing, Spring Boot, and cloud development.
You can use this roadmap as:
- A self-study guide to build your own Java foundation
- A mentorship plan for guiding interns or junior developers
- A reference when preparing for technical interviews
- Fork this repository for personal study
- Follow the sections in order — each builds on the previous one.
- Complete all checklist items ✅ before moving to the next topic.
- Do the practical exercises 💻 to reinforce what you learn.
- You can create a PR for reviewing your practical task
- Use it together with official documentation, books, and tutorials.
💡 Tip: Treat this roadmap like a real course — practice daily and write small projects to connect theory with practice.
| 🔗 | Section | Description |
|---|---|---|
| 1️⃣ | Java Programming Basics | Learn syntax, variables, data types, conditions, loops, and arrays. |
| 2️⃣ | Object-Oriented Programming in Java | Understand classes, objects, inheritance, polymorphism, and encapsulation. |
| 3️⃣ | Java Language Mechanisms | Explore static/final, generics, exceptions, annotations, and enums. |
| 4️⃣ | Working with Utilities and Core APIs | Work with strings, collections, dates, files, and regex. |
| 5️⃣ | Advanced Java Programming | Learn lambdas, Stream API, functional programming, and modern Java features. |
| 6️⃣ | Concurrent and Asynchronous Programming in Java | Threads, synchronization, executors, CompletableFuture, and locks. |
| 7️⃣ | Working with Databases, JDBC, JPA, and Hibernate | Connect Java apps to databases, ORM, transactions, and query optimization. |
| 8️⃣ | Spring Framework and Spring Boot | Build real-world applications using Spring, REST APIs, and dependency injection. |
| 9️⃣ | Spring Advanced: Security, WebFlux, Messaging, Cloud | Dive into security, reactive programming, RabbitMQ, and cloud integration. |
You can track your progress directly in GitHub by checking off completed items in each file.
Example:
- [x] Installed JDK and configured environment
- [ ] Completed exercises for conditional statements
- [ ] Learned about encapsulation and inheritance