To create maintainable and bug-proof code, it's necessary to master Java fundamentals. Join us on this incredible journey, visiting new features of the JDK 21 system as well as the best previous Java version features. During this journey, you will improve your craft as a software engineer. These short challenges will make you sharper to read and understand code. Solve the puzzles to learn the full power of the Java language. Apply the techniques and develop concise code where bugs will have difficulty hiding. Come to this session to boldly go where no Duke has gone before!