CS 535 Object-Oriented Programming & Design
Spring Semester, 1999
© 1999, All Rights Reserved, SDSU & Roger Whitney
San Diego State University -- This page last updated 23-Mar-99
Classes verses Objects
2.11 Be sure that the abstractions that you model are classes and not simply the roles that object play
Constraints4.9 When implementing semantic constraints, it is best to implement them in terms of class definition.
Often class definition based constraints will lead to a proliferation of classes.
In this case the constraint must be implemented in the behavior of the class.
This is often done in the constructor.
4.10 When implementing semantic constraints in a constructor, place the constraint test in the constructor as far down as a containment hierarchy as the domain allows.
4.11 The semantic information on which a constraint is based is best placed in a central, third party object when that information is volatile.
4.12 The semantic information on which a constraint is based is best placed in the classes involved in the constraint when that information is stable.
Copyright ©, All rights reserved.
1999 SDSU & Roger Whitney, 5500 Campanile Drive, San Diego, CA 92182-7700 USA.
OpenContent license defines the copyright on this document.
Previous    visitors since 23-Mar-99    Next