Java Challenges
Learn Java for free by writing real code, graded by hidden tests.
- Java
- 58 lessons
- ~12 hours
- Free
Learn Java for free on Libre Academy with the Java Challenges challenge pack: 58 interactive lessons you complete by writing real code in a built-in editor, graded instantly by hidden tests. No paywall, no sign-up — it runs in your browser and the free desktop app.
What you get
- Hands-on lessons with a real editor and instant, test-graded feedback.
- Free and open source — no account required to start.
- Runs in your browser, and offline in the free desktop app.
- Java desktop app (native toolchain).