Hello, Son Won-cheol! In the past, I received feedback that it was good to conduct the class in the form of live coding in other lectures, so I tried it this time as well, and fortunately, I am happy that it helped the learning effect. 😉 Not all programming languages actually use all the contents covered in books or lectures, but there are definitely places where those functions are needed, so I think it will be useful if you know them well. 🎊 I sincerely thank you for your valuable course review, and it is a great reward for me to be able to help you build a solid foundation in Java. 😊 Thank you. - I also code