Question

Question 3.25 in textbook page 57.

Several classes shown in Figure E3.12 have attributes that are really references to other classes and could be replaced with associations. A person may have up to three companies as employers. Each person has an ID. A car is assigned an ID. Cars may be owned by persons, companies, or banks. Owner ID refers to the ID of the person, company, or bank who owns the car. A car loan may be involved in the purchase of a car.

Burying object references as references is the incorrect way to construct a model. Prepare a class diagram without IDs and using association and generalization. Try to assign multiplicities. You may need to add one or more classes of your own.

Note:

Must use correct UML notation.

Must typed in word file.

If the diagram is dawn using other tools, copy and paste to word file.

Bank Person Car Car Loan Company ownerID vehicleID name name name birthdate vehicleID customer Type bankID Company employer ID owner Type customerID employer2ID model account Number bankID employer 3ID year personID interest Rate currentBalance address Figure E3.12 Classes with some attributes that are references.

Answer 1

We can have a general class Identity which is abstact class and the classes like Person, Company and Bank can extent from Identity class. The refrences to personId, companyId and bankId can be replaced by associating Identity class.

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