Defer identification of state variables pattern

Deferring identification of state variables is an approach to solving the Parallel Inheritance Hierarchies problem that sometimes appears in OO designs. The OO design below shows an example of the Parallel Inheritance Hierarchies problem. This design shows the abstract class Vehicle holding an Operator as one of it's fields. One problem with this a Car object might be able to have a Pilot as its Operator instead of a Driver.

More to come soon on this page.

See also

• Parallel inheritance hierarchies smell
• Intelligent children pattern