We'll work on lab J3 today and tomorrow. Wednesday's class will be a hybrid of discussion, recitation, and lecture. It may be a personal quirk, but I really get annoyed by email that comes from a name other than your own. We use classes in different ways. Some classes provide templates for creating new objects.
Some classes collect utility methods.
Some classes do a combination of these things. Classes typically have many parts. A comment that describes the purpose of the class. Some fields Some fields are associated with each object. Some fields are associated with the class as a whole.