I was already working with Java in my practice, so there wasn't anything particularly new to me, but it was good for reviewing at a fast pace! In particular, the problem solving in between was fun~ As expected, I think I can trust Younghan's lectures. As I work, I feel the importance of test code more and more, and I keep thinking that it would have been good if I had known the importance of test code and developed the habit from the time I was a beginner. So I thought that it would be a great help to beginners if the part about testing methods with jUnit was reinforced, even if it was just a little! Thank you so much for providing such a valuable lecture for free~👍 I look forward to future lectures! (In particular, I'm most looking forward to the database lecture...!!!)