1. Domain Modeling Part2: Domain Class Diagram Chapter 4 pp. 103-114 - part 2 1

2. UML Class Diagram Class Diagram  A UML diagram  2 Types: − Domain Class Diagram In Analysis Phase, similar to the ERD Models things in the users’ work domain − Design Class Diagram In Design Phase Model software classes 2

3. Entity Attribute Relationship Cardinality Domain Class Attribute Association Multiplicity 3 Domain Class Diagram ERD Domain Class Diagram Similar to ERD

4. Domain Class Diagram Relationships can be:  Associations – regular relationships  Generalization/Specialization – “is-a” association  Whole-Part – “has-a” association − Aggregation − Composition 4

5. Generalization/Specialization Hierarchy A hierarchical relationship  Superclass(Base) & Subclass (Derived)  Inheritance  Abstract vs. Concrete Class 5

6. Generalization/Specialization Hierarchy 6

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8. Aggregation -a Whole-Part Hierarchy Aggregation  removable parts  can exist separately − e.g. computer & its parts 8 Tire Engine Car Employee Team 0..*1..* MON 12:20

9. Composition -a Whole-Part Hierarchy Composition  non-removable parts  stronger  cannot exist separately 9 Leg Hand Person

10. Domain Class Diagram An Example Association Class Generalization/ Specialization 10