A simple rule to follow when creating problem domain classes and data access and manipulation classes is that there should be ______________.
A) One data access and manipulation class for each concrete problem domain class
B) Two data access and manipulation classes for each concrete problem domain class
C) N data access and manipulation classes for each concrete problem domain class, where N is the number of methods in the problem domain class
D) N data access and manipulation classes for each concrete problem domain class, where N is the number of subclasses of the problem domain class
E) none of these

Question

Quizplus · Accepted Answer

There should be one data access and manipulation class for each concrete problem domain class. This facilitates separation of concerns and helps maintain a clear and organized code structure. It also makes it easier to make changes to the data access and manipulation code without affecting the problem domain code. Having two or more data access and manipulation classes for each problem domain class or basing the number of data access and manipulation classes on the number of methods or subclasses of the problem domain class can lead to unnecessary complexity and reduced maintainability.

A Simple Rule to Follow When Creating Problem Domain Classes