July 14, 2010

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Codemanship's Code Smell Of The Week - Data Classes

A key goal of OO design is to minimise depdencies between classes by packaging data and behaviour as close together as we can. In practice, a good rule of thumb for class design is to put fields and methods that use those fields in the same classes. Data classes are classes which just have fields and no behaviour (besides simple getters and setters), and they break this rule of thumb, creating serious dependency issues in your code.

Here, Jason Gorman demonstrates how to refactor data classes by moving the methods (or parts of methods) that use fields of dta classes into the classes that contain those fields.

Download the source code from http://bit.ly/czsOHP

For training and coaching in refactoring, TDD and OO design, visit http://www.codemanship.com

Posted 10 years, 8 months ago on July 14, 2010