I frequently teach Computer Science II, a Data Structures course in Java, but there is a long list of basic programming skills and rules that students tend to forget from their Computer Science I course. This video is meant to be a refresher for them, but maybe others can benefit as well!
Correction: At 4:40, the hex value shown when printing a reference type whose toString() method is not overloaded is actually NOT its memory address, but rather something known as an identity hash code.