Structural Models

This quiz covers topics including the purpose and use of structural models, class diagrams (classes, associations, multiplicity notation, named associations, attributes, operations), generalization hierarchies (inheritance, arrowhead direction, attribute and operation inheritance), and aggregation associations (diamond notation, whole-part relationships)

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QUESTION OF

Views #: 29

Questions #: 13

Time: 15 minutes

Pass Score: 80.0%

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Step

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Purpose of Structural Models

1 pts

volume_mute

Structural models of software display:

The business processes in which the software system is embedded

The interactions between users and the system during specific use cases

The organization of a system in terms of the components that make it up and their relationships

The dynamic behavior of the system as it executes and responds to events

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Explanation

Static vs. Dynamic Structural Models

1 pts

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True or False: The static structural model of a system's components and the dynamic model of the system as it executes are always the same.

True

False

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Explanation

Reading a Simple Class Diagram

1 pts

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The diagram below shows a simple UML class diagram with two classes and an association.

What does the "1" annotation at each end of the association line indicate?

There is only one type of patient in the system

The association is optional — a patient may or may not have a record

The Patient class has only one attribute

Each Patient object is associated with exactly one Patient Record object, and each Patient Record is associated with exactly one Patient

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Explanation

Multiplicity Notation

2 pts

Match each multiplicity notation to its correct meaning in a UML class diagram.

To complete the line match

Click on an item in the first group
Click on the match in the second group

To delete a match, double click on a line

Notation

1..*

1..4

Meaning

An exact number of objects is involved — in this example, between 1 and 4 objects

Exactly one object is involved in the association

One or more objects are involved (at least one, but no upper limit)

An indefinite number of objects may be involved (zero or more)

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Explanation

Named Associations

1 pts

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In a UML class diagram, associations can be given names. What is the purpose of naming an association?

To enforce the multiplicity constraint programmatically

To give the reader an indication of the type of relationship that exists between the associated classes

To mark the association as mandatory rather than optional

To indicate the direction of data flow between the two classes

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Explanation

Reading the Mentcare Class Diagram

1 pts

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Study the class diagram below showing classes and associations in the Mentcare system.

According to this class diagram, what does the multiplicity 1..4 on the association between Consultation and Hospital Doctor mean?

Each Consultation involves between 1 and 4 Hospital Doctors

A Hospital Doctor works at 1 to 4 different hospitals

A Hospital Doctor can be involved in at most 4 consultations

There are exactly 4 types of Hospital Doctor in the system

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Explanation

Three Sections of a Detailed Class Box

2 pts

The diagram below shows a UML class box with full detail for a Consultation class.

Match each section of the UML class box to what it contains.

To complete the line match

Click on an item in the first group
Click on the match in the second group

To delete a match, double click on a line

Section

Top section

Middle section

Bottom section

Contains

The operations (methods) associated with the object class — the functions the class can perform

The name of the object class

The attributes of the class — the object's characteristics, optionally with their types

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Explanation

Class Diagrams vs. Semantic Data Models

1 pts

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True or False: At a high level of detail, UML class diagrams look like semantic data models used in database design — both show entities, their attributes, and the relations between them.

True

False

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Explanation

Generalization — Purpose

1 pts

volume_mute

Generalization in object-oriented modeling is a technique used to:

Define the boundary between a system and its environment

Manage complexity by defining general classes whose characteristics are shared by all members, so that common information is maintained in one place only

Show the sequence of interactions between objects in a system

Combine multiple objects into a single composite object

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Explanation

Reading a Generalization Hierarchy

1 pts

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The diagram below shows a UML generalization hierarchy for doctor types in the Mentcare system.

In this UML generalization hierarchy, which direction does the arrowhead point?

Upward, toward the more general superclass

There are no arrowheads — generalization uses plain lines only

Horizontally, between sibling classes at the same level

Downward, toward the more specific subclass

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Explanation

Inheritance of Attributes and Operations

1 pts

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True or False: In a generalization hierarchy, the attributes and operations of a higher-level class are also associated with all lower-level subclasses — subclasses inherit from their superclasses and add more specific attributes and operations of their own.

True

False

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Explanation

Generalization and OO Languages

1 pts

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In object-oriented languages such as Java, generalization as modeled in a UML class diagram is implemented using:

Interface definitions

Database foreign key relationships

The class inheritance mechanism built into the language

Abstract factory design patterns

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Explanation

Aggregation — Definition and Notation

1 pts

volume_mute

The diagram below shows an aggregation association in a UML class diagram.

In UML, the diamond shape on an aggregation association is placed next to which class, and what does aggregation mean?

Diamond next to the part class; aggregation means the part class has no operations

Diamond next to the whole class; aggregation means that one object (the whole) is composed of other objects (the parts)

Diamond next to the part class; aggregation means the part class is abstract

Diamond in the middle of the line; aggregation means both classes are optional

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Explanation

Undergraduate Professional

Purpose of Structural Models

Correct Answer

Explanation

Static vs. Dynamic Structural Models

Correct Answer

Explanation

Reading a Simple Class Diagram

Correct Answer

Explanation

Multiplicity Notation

Notation

Meaning

Correct Answer

Explanation

Named Associations

Correct Answer

Explanation

Reading the Mentcare Class Diagram

Correct Answer

Explanation

Three Sections of a Detailed Class Box

Section

Contains

Correct Answer

Explanation

Class Diagrams vs. Semantic Data Models

Correct Answer

Explanation

Generalization — Purpose

Correct Answer

Explanation

Reading a Generalization Hierarchy

Correct Answer

Explanation

Inheritance of Attributes and Operations

Correct Answer

Explanation

Generalization and OO Languages

Correct Answer

Explanation

Aggregation — Definition and Notation

Correct Answer

Explanation

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