Question

Consider the classes involved when modeling a bicycle and all its parts. Draw a domain model class diagram that shows the whole-part relationships involved, including multiplicity. Which types of whole-part relationships are involved?

Answer 1

Solution:

step: 1 of 2

Domain model class diagram:

Domain model class diagram is that the class exhibits about the objects in the problem domain.

• The domain class contains the attributes and associations.

Whole-part:

Whole-part relationship is the association between the classes in which one class act as a part or component for another class.

• For example, “bicycle€ is made up of parts such as body, wheels, breaking mechanism, and steering mechanism.

Notation used for whole-part relationship:

• The diamond shape in the diagram represents that the classes are divided into subclasses and it shows the whole-part relationship between the classes.

Domain model class diagram:

Consider that the following domain model class diagram uses the whole-part relationship to model the biycle and its parts:

In the above diagram,

• The “bicycle€ is the superclass and it is further divided into five classes.

• The diamond shape in the diagram represents that the superclass is “bicycle€ and it is further subdivided into classes such as bicycleFrame, bicycleBody, Wheels, and exteriror decorations.

• The superclass bicycle has its own attributes such as ProductDeveloper, year, and modelOfCar.

o The subclass bicycleFrame has its own attributes such as sizeOfFrame and specifications.

o The subclass BicycleBody has its own attributes such as no.of pedals, crossbar, seat post, no

of tires.

o The subclass wheels has its own attributes such as numberOfWheels.

o The subclass ExteriorDecoration has its own attributes such as colorOfbicycle and type of bicycle.

• Additionally the multiplicity constraint for all the classes are “1†because the frame, body, exterior decoration are one except the class wheels.

• This is because the bicycle contains four wheels so the multiplicity constraint is “4†for “wheelsâ€.

step: 2 of 2

Aggregation whole-part relationship:

In the above domain model diagram, the type of whole-part relationship involved in the diagram is aggregation.

• Because, the “bicycle€ is the individual component and its parts are defined separately as bicycleFrame, bicycleBody, Wheels, and exteriorDecoration.

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