Practice Java Online with Interactive Exercises

Choose a Java practice topic

• Practice Core Java Basics — 26 exercises
• Practice Control Flow — 24 exercises
• Practice Arrays — 22 exercises
• Practice Strings — 19 exercises
• Practice OOP Basics — 24 exercises
• Practice Inheritance — 20 exercises
• Practice Collections — 22 exercises
• Practice Exception Handling — 24 exercises
• Practice File I/O — 24 exercises
• Practice Data Structures & Algorithms — 60 exercises

How the practice lab works

1. Open a topic and select an exercise.
2. Review the problem, expected output, and hints.
3. Write and run Java code in the interactive editor.
4. Save bookmarks and progress locally in your browser.