[[TableOfContents]]
= Chapter 12 Big Refactorings =
== Tease Apart Inheritance ==
 * You have an inheritance hierarchy that is doing two jobs at once.[[BR]]''Create two hierarchies and use delegation to invoke one from the other.''
http://zeropage.org/~reset/zb/data/TeaseApartInheritance.gif
== Convert Procedural Design to Objects ==
 * You have code written in a procedural style.[[BR]]''Turn the date records into objects, break up the behavior, and move the behavior to the objects.''
http://zeropage.org/~reset/zb/data/ConvertProceduralDesignToObjects.gif 
== Separate Domain from Presentation ==
 * You have GUI classes that contain domain logic.[[BR]]''Separate the domain logic into separate domain classes.''
http://zeropage.org/~reset/zb/data/SeparateDomainFromPresentation.gif
== Extract Hierarchy ==
 * You have a class that is doing too much work, at least in part through many conditional statements.[[BR]]''Create a hierarchy of classes in which each subclass represents a special case.''
http://zeropage.org/~reset/zb/data/ExtractHierarchy.gif  
----
["Refactoring"]