Exercise: Object Oriented Data Modeling

Questions for: Object Oriented Data Modeling

An abstract class is which of the following?
A:
A class that has direct instances, but whose descendants may have direct instances.
B:
A class that has no direct instances, but whose descendants may have direct instances.
C:
A class that has direct instances, but whose descendants may not have direct instances.
D:
A class that has no direct instances, but whose descendants may not have direct instances
Answer: B
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Composition is a stronger form of which of the following?
A:
Aggregation
B:
Encapsulation
C:
Inheritance
D:
All of the above.
Answer: A
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Multiplicity is the same as what concept for an ERD?
A:
Relationship
B:
Attribute
C:
Entity
D:
Cardinality
Answer: D
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The object-oriented development life cycle is which of the following?
A:
Analysis, design, and implementation steps in the given order and using multiple iterations.
B:
Analysis, design, and implementation steps in the given order and going through the steps no more than one time.
C:
Analysis, design, and implementation steps in any order and using multiple iterations.
D:
Analysis, design, and implementation steps in any order and going through the steps no more than one time.
Answer: A
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The fact that the same operation may apply to two or more classes is called what?
A:
Inheritance
B:
Polymorphism
C:
Encapsulation
D:
Multiple classification
Answer: B
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