Provides a wizard which guides the user through the process of adding a Design
Pattern or binary class relationship to a BlueJ project. The user can select a
pattern or relationship and choose specific names for the component classes. A
set of basic classes are then generated. The classes have sufficient code
out-of-the-box to allow exploration of the behaviour with no additional coding.

They can then be edited to meet the requirements of specific problems. A
selection of patterns and relationships is provided, and other patterns can be
defined using XML files and added into the extension.