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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).

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