Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews.

Aug 11, 2025 · Java coding practice problems help learners and professionals improve their programming skills through real-world challenges, covering topics like data structures, algorithms, …

Test your Java skills with code challenges from all categories: Code challenges are interactive coding exercises where you write Java code to achieve a specific result. Each challenge presents you with a …

Dec 20, 2024 · Explore 25 tough Java coding challenges across recursion, OOP design, algorithms, concurrency, and more. Improve your skills with task overviews and code solutions.

Practice Java coding with fun, bite-sized exercises. Earn XP, unlock achievements and level up. It's like Duolingo for learning to code.

Codewars is where developers achieve code mastery through challenge. Train on kata in the dojo and reach your highest potential.

We’ve organized 30 Java coding challenges specifically for Junior, Mid-Level, and Senior developers for each level. It’s the perfect way to prepare for your next career move or to find the perfect candidate …

Practice Java with 10 coding challenges including FizzBuzz, palindromes, and Fibonacci. Each problem includes hints and tested solutions.

Master Java programming with free online coding challenges. Practice Java algorithms, data structures, OOP concepts, and compete in real-time battles. Perfect for Java developers at all levels.

Improve your Java programming skills with our collection of 60 + interactive coding challenges. Track your progress and build coding confidence! Perfect for those just starting with Java. Build confidence …