Deck 7: Understanding More Complex Requirements Models With Generalizationspecialization and Whole-Part Hierarchies

Question 1

The generalization/specialization hierarchy can lead to implementation problems if not composed of relatively stable or __________ classes.

Answer 1

Constant

Question 2

Which of the following is NOT true concerning generalization/specialization hierarchies?

A) A class might inherit attributes and methods from multiple classes.
B) They show a hierarchy of classes and subclasses that lead from the general to the specific.
C) They show a hierarchy of classes representing a collection of parts.
D) A class mighty inherit attributes and methods from an abstract class.

Answer 2

C

Question 3

Which of the following is TRUE concerning generalization/specialization hierarchies?

A) They show a hierarchy of classes representing a collection of parts.
B) They show a hierarchy of classes and subclasses that lead from the general to the specific.
C) They might be defined as a "contains" relationship.
D) They might be defined as a "includes" relationship.

Answer 3

B

Question 4

Which of the following is NOT true concerning whole-part hierarchies?

A) They might be defined as a "includes" relationship.
B) They might be defined as a "contains" relationship.
C) They include particularly strong relationships.
D) They might be defined as a "is-a" relationship.

Question 5

The symbol for a whole-part relationship is a _______________?

A) diamond on the line connecting the two classes
B) hollow circle on the line connecting the two classes
C) filled circle on the line connecting the two classes
D) triangle on the line connecting the two classes

Question 6

Defining a(n) __________ relationship in a class diagram can increase the clarity and precision of the model.

Question 7

The generalization/specialization hierarchy works best when an object in a special class will always remain a __________ of that class.

Question 8

A(n) ___________ hierarchy shows object relationships between an object in one class and objects in other classes that make up its "parts".

Question 9

The terms aggregation and composition are used for __________ relationships in UML.

Question 10

The generalization/ specialization hierarchy shows a hierarchy of classes and subclasses that lead from the __________ to the __________.

Question 11

A(n) __________ hierarchy allows one class to inherit attributes and methods from another.

Question 12

A(n) __________ class exists only to allow subclasses to inherit from it.

Question 13

Which of the following is NOT described by scenarios?

A) User's interaction with the system
B) Use cases
C) Events that occur in the system
D) class diagrams

Question 14

Use cases and scenarios can be used to clarify system requirements.

Question 15

Which of the following is TRUE concerning whole-part hierarchies?

A) They include particularly strong relationships.
B) They are organized into superclasses and subclasses.
C) They define an inheritance relationship.
D) They are defined by what they do not contain.

Question 16

A whole-part hierarchy allows one class to inherit attributes and methods from another.

Question 17

A generalization hierarchy shows object relationships between an object in one class and objects in other classes that make up its "parts".

Question 18

A _______ on the line indicates a whole-part relationship.

A) triangle
B) square
C) circle
D) diamond

Question 19

_________________ occurs when the objects in a class inherit attributes and services form multiple classes.

Question 20

A possible solution to problems introduced in multiple inheritance would be to model the classes according to the ___________ they play.

Question 21

Sometimes a general class includes objects and is also specialized into subclasses that also include objects.

Question 22

An important aspect of the object-oriented approach is the process of organizing the information system into a set of hierarchies.

Question 23

A problem with generalization hierarchies is that they tend to increase redundancy in the model.

Question 24

In multiple inheritance, it is preferred to be able to trace superclasses back up the hierarchy to a common class.

Question 25

Multiple inheritance occurs when objects in the class inherit attributes and services from multiple classes.

Question 26

Several object- oriented programming languages do not allow multiple inheritance.

Question 27

A relationship can be optional.