java-tutorial

18) Next Steps: Projects to Build

Pick one and build it end-to-end.

Beginner projects

1. CLI calculator (parse args, handle errors)
2. To-do list (file persistence)
3. Word counter (maps, sorting)

Intermediate projects

1. Simple HTTP client (call a public API, parse JSON)
2. Mini library system (OOP + collections)
3. Concurrency downloader (executors + futures)

Advanced projects

1. Build a small REST API (Spring Boot)
2. Write a small Java library with tests and a published artifact
3. Performance profiling exercise (JFR / async-profiler)

Suggested learning order from here

• Solidify collections, streams, and testing
• Learn Maven/Gradle
• Build 2–3 projects and deploy something

Table of contents

1. Getting Started: Install, run, and your first program
2. Java Basics: types, variables, operators, formatting
3. Control Flow: if/switch/loops
4. Methods: parameters, return values, overloading
5. OOP: classes, objects, encapsulation
6. Inheritance & Polymorphism (and when not to use them)
7. Interfaces, abstract classes, and design basics
8. Exceptions and error handling
9. Strings, files, and I/O basics
10. Collections: List/Set/Map and Big-O intuition
11. Generics (the useful parts)
12. Lambdas & Streams
13. Dates and time (java.time)
14. Testing with JUnit 5 (basics)
15. Concurrency: threads, executors, futures
16. JVM basics: memory, GC, performance habits
17. Build tools: Maven essentials (recommended)
18. Next steps: projects to build