Lecture 18:

Charlie on the MTA: and he never returned ...

The problem dealing with the routes and stations is covered in the book. Lecture 20 from Spring 2005 discusses a similar problem: the classes that represents lists of books with multiple authors and authors that keep track of all the books they wrote.

Circularly referential data.

Lecture 19:

Getting a New Phone Number

Modifying fields, modifying structures. pdf html

Code for Lecture 19 --- runs in Advanced ProfessorJ: phonelists.java