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thanks!

Hello Dev! Great effort on the puzzle - these can be really tricky sometimes! The output will actually be "Java", but also an "error". It's a common misconception, but in Java, String objects are immutable, meaning once they're created, they can't be changed. When you use `concat()`, it doesn't alter the original string; it creates a new one. So, for "JavaRocks" to be printed, you'd need to reassign the result back to `s` like so: ```java´´´ String s = "Java"; s = s.concat("Rocks"); System.out.println(s);

Hello @dzvsow2643 Thanks for your comment. You're right! In Java, a superclass reference can indeed point to a subclass object. This is a key aspect of polymorphism in object-oriented programming. Just remember, the superclass reference will only access methods and fields defined in the superclass, unless they're overridden in the subclass. Great observation, keep exploring Java!