This is a really good lecture. It focuses more on reviewing basic Java grammar than on data structure content. First, I would like to thank Professor Kwon Oh-Heum for filming and providing a high-quality lecture. The lecture is structured as a data structure class, but two-thirds of the entire lecture is a review of basic Java grammar (including generics). The reason why the Java grammar review takes up a large portion is because the full-fledged data structure content that was supposed to be covered in the latter part was not filmed due to the professor's personal circumstances. The data structure content is all about the linked list in the latter half of the lecture. So this lecture seems more suitable for those who want to review undergraduate-level Java grammar through examples rather than those who want to study data structures in depth.