The class library (including source code) was published in conjunction with an excellent textbook titled Introduction to Computing and Programming with Java: A Multimedia Approach (see Resources). Unlike many textbook authors, Guzdial and Ericson did not hide their source code or their class library behind a password. As of the date of this writing, the class library and the source code along with a wealth of other related material is available for free downloading at Media Computation book in Java (see Resources). The library is also included on a CD that is packaged with the textbook.