Just Java™ 2

Exercises

1. Describe the Factory design pattern and state its use.

2. Write a DTD that describes a CD inventory file. Each CD is either domestic or imported. These details are stored for all CDs: artist, title, price, quantity in stock. Imported CDs also have these fields: country of origin, genre, non-discount status, language, and lead time for reorder. Write some XML instance data describing your five favorite CDs (include a couple of imported CDs, too).

3. Validate your XML file from the previous question by running it against the DOMEcho program that comes with the Java XML library. In the output you get, explain what the text nodes with a value of “[WS]” are. Hint: Try varying the number of spaces and blank lines in your instance data, ...