Domain Class Diagram Chapter 4 Part 2 pp. 103-114

UML Class Diagrams Domain Class Diagram Design Class Diagram In Analysis Phase, similar to the ERD Models things in the users’ problem domain Design Class Diagram In Design Phase Model software classes

ERD vs Domain Class Diagram Entity Attribute Relationship Cardinality Instance Domain Class Attribute Association Multiplicity Object

Association Types Regular Associations Association Class Generalization Hierarchies  is-a Whole-Part Associations  has-a

Association Class

Generalization Hierarchy “is-a” aka: Generalization/Specialization Hierarchy Superclass (Base) & Subclass (Derived) Inheritance Abstract vs. Concrete Class

Generalization Hierarchy

Generalization Hierarchy How many super classes are there? Are there any mistakes in the identification of abstract & concrete classes?

Whole-Part Hierarchies “has-a” Aggregation removable parts can exist separately e.g. computer & its parts “has-a” Composition non-removable parts stronger cannot exist separately Tire Engine Car Person Leg Hand

Summary How many super classes are there? How many sub classes are there? What type of class is Account? What type of classes are Savings & Checking Account? What type of class is Transaction?

Summary How many super classes are there? How many sub classes are there? Is there an Association Class? What does 0..2 mean?