Im a little confused on what classes are!
I just read a chapter in my java book about classes. It gives an example of a problem and says you will need 3 classes, a customer class, a cars class, and a service quote class. each get different things and do different things. my question is, are all these classes in one program, or are they separate programs that interact with each other somehow.
because earlier in the book i think i saw a class in one program, but then main was interacting with it from another program or something.
also whats the difference of constructors and methods? do constructors only initialize things?