JavaOne Conference Trip Report

Object-Oriented Design Patterns

Java provides the tools to build flexible models by designing with interfaces. Interfaces have a profound effect on building general objects, but they also increase the complexity of the design.

Please see the initial design slide from the sessions link in the navigation bar. The initial design has a number of problems:

Reuse is larger than a class
Could use interfaces to increase flexibility
Hard-wired messaging

There are ten patterns located at http://www.oi.com. Here are four patterns for discussion today:

Party-role
Composition, not inheritence. Add plugin points where it makes sense, where you need flexibility
Common signature
Feature sequencing
Plug-in architecture

Use interfaces where we expect change.

Now go to the slides and check out the sample engineering application. The diagrams and software were written using TogetherJ, which I've downloaded, installed, and run just enough to know it works a bit.