Well, congratulations! You’ve reached the end of this course.
I hope you’ve found it helpful, and that you feel that you now know how to program in Java! Of course, practice makes perfect, so you may still have a way to go. Now’s the time to find something useful — practical, even — to implement, and make heavy use of your new-found skillset. Only by iterating on such useful applications will you become truly proficient in Java.
I wish you the best of luck in your future Java endeavors!