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SZ
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Registered: Apr 2001
Location: New York
Posts: 492

interfaces

30) Refer to the exhibit to answer the question.

Which of the following are TRUE?

a) Classes "X" and "Y" are subclasses of Mortgageable.

b) Instances of "X" and "Y" can be passed as parameters declared as type Mortgageable.

c) "X" and "Y" must implement a getAppraisedValue() method.

d) There are instances of Mortgageable in the production system.

Multiple Select - Please select all of the correct answers (this question has 2 correct choices).

+++++++++++++++++++++

See the attached diagram.

A is incorrect because Mortgageable is an interface, not a class. Both X and Y are classes which implement (realize) the Mortgageable interface.

D is a bit incongruous - this is a class diagram, not an object or deployment diagram.

B and C are the typical features of classes which realize interfaces.

B is a very elegant benefit of using interfaces because it dramatically decreases the coupling in a system. Methods which take a parameter of type Mortgageable only need to know about the interface, and nothing else about the details of the implementing class.

Attachment: mortgageable.gif
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Old Post 03-26-2002 04:34 AM
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