Deck 6: Object Modeling

Question 1

After one identifies a system's objects,classes,and relationships,one should develop an object relationship diagram that provides an overview of the system.

Answer 1

True

Question 2

The same message to two different objects produces the same results.

Answer 2

False

Question 3

An object represents a real person,place,event,or transaction.

Answer 3

True

Question 4

In a state transition diagram,the circle at the right with a hollow border is the initial state.

Question 5

In a state transition diagram,the states appear as rounded rectangles with the state names inside.

Question 6

A control is a specific member of a class.

Question 7

The strongest relationship among objects is called inheritance.

Question 8

Use cases cannot interact with other use cases.

Question 9

A use case represents the steps in a specific business function or process.

Question 10

A method is like a blueprint or template for all the objects within a class.

Question 11

Class diagrams evolve into code modules,data objects,and other system components.

Question 12

An object includes data,but not the processes that affect that data.

Question 13

When use cases are identified,all the related transactions should be kept separate.

Question 14

A method is an adjective that describes the object's current status.

Question 15

By limiting access to internal processes,an object prevents its internal code from being altered by another object or process.

Question 16

Attributes are similar to adjectives that describe the characteristics of an object.

Question 17

Just as objects are similar to adjectives,attributes resemble verbs that describe what and how an object does something.

Question 18

A class diagram resembles a horizontal flowchart that shows the actions and events as they occur.

Question 19

Some objects might have a few attributes;others might have dozens.

Question 20

Although the UML can be used for business process modeling and requirements modeling,it is mainly used to support O-O system analysis and to develop object models.

Question 21

A star marks the end of the lifeline.

Question 22

A black box wants and needs outside interference.

Question 23

Object-oriented (O-O)analysis describes an information system by identifying things called objects.

Question 24

The focus indicates when an object sends or receives a message.

Question 25

A(n)_____ represents a person,a place,an event,or a transaction that is significant to the information system.

A) object
B) instance
C) class
D) model

Question 26

When the outcome of one use case is incorporated by another use case,we say that the second case uses the first case.

Question 27

A(n)_____ is a specific member of a class.

A) key
B) index
C) file
D) instance

Question 28

_____ is a widely used method of visualizing and documenting an information system.

A) Unified Modeling Language (UML)
B) The Java Virtual Machine (JVM)
C) The UNiplexed Information and Computing System (UNIX)
D) Multimedia Logic (ML)

Question 29

There are few CASE tools tailored to UML.

Question 30

In an object-oriented system,objects can _____ certain attributes from other objects.

A) broadcast
B) concatenate
C) inherit
D) reformat

Question 31

Systems analysts can create diagrams that appear to be correct but are in fact incorrect when it comes to the rules of the UML.

Question 32

Encapsulation allows objects to be used as modular components anywhere in the system.

Question 33

The Unified Modeling Language (UML)represents an object as a _____ with the object name at the top,followed by the object's attributes and methods.

A) circle
B) rectangle
C) pentagon
D) rhombus

Question 34

Classes that send or receive messages are shown at the bottom of the sequence diagram.

Question 35

A car performs a(n)_____ called OPERATE WIPERS when it is sent a message with the wiper control.

A) method
B) role
C) command
D) objective

Question 36

A red Mustang is a(n)_____ of the CAR class.

A) index
B) key
C) metric
D) instance

Question 37

An object has certain _____,which are characteristics that describe the object,such as the make,model,and color of a car.

A) keys
B) attributes
C) indices
D) elements

Question 38

Systems analysts define an object's attributes during the systems design process.

Question 39

An object's _____ are the tasks or functions that the object performs when it receives a command to do so.

A) roles
B) utilities
C) instances
D) methods

Question 40

An object belongs to a group or category called a(n)_____.

A) aggregate
B) concatenation
C) class
D) packet

Question 41

_____ describe what objects need to know about each other,how objects respond to changes in other objects,and the effects of membership in classes,superclasses,and subclasses.

A) Instances
B) Relationships
C) Aggregates
D) Clusters

Question 42

_____ enable objects to communicate and interact as they perform business functions and transactions required by a system.

A) Aggregates
B) Relationships
C) Clusters
D) Linkages

Question 43

Objects within a class can be grouped into _____,which are more specific categories within a class.

A) grids
B) units
C) subclasses
D) matrices

Question 44

A(n)_____ represents the steps in a specific business function or process.

A) relationship diagram
B) use case
C) data flow unit
D) interaction diagram

Question 45

A(n)_____ resembles a verb and defines specific tasks that an object can perform.

A) attribute
B) method
C) command
D) message

Question 46

In a use case,the _____ is shown as a stick figure with a label that identifies its role.

A) actor
B) association
C) linkage
D) service request

Question 47

The concept that a message gives different meanings to different objects is called _____.

A) encapsulation
B) dynamic addressing
C) polymorphism
D) linear addressing

Question 48

The Unified Modeling Language (UML)symbol for a use case is a(n)_____ with a label that describes the action or event.

A) rectangle
B) triangle
C) dashed line
D) oval

Question 49

An _____ shows the objects and how they interact to perform business functions and transactions.

A) object relationship diagram
B) object precedent chart
C) object antecedent chart
D) object interaction diagram

Question 50

The _____ of an object is an adjective that describes the object's current status.

A) polymorphism
B) encapsulation
C) resemblance
D) state

Question 51

All objects within a(n)_____ share common attributes and methods.

A) catalog
B) register
C) index
D) class

Question 52

A major advantage of object-oriented (O-O)designs is that systems analysts can save time and avoid errors by using _____ objects.

A) dynamic
B) feasible
C) modular
D) linear

Question 53

Inheritance enables an object,called a _____,to derive one or more of its attributes from a parent.

A) child
B) user
C) package
D) suite

Question 54

_____ allows objects to be used as modular components anywhere in a system.

A) Dynamic addressing
B) Technical feasibility
C) Encapsulation
D) Linear addressing

Question 55

A bank account object can have a specific attribute called a(n)_____ that can be active,inactive,closed,or frozen.

A) state
B) grade
C) instance
D) status

Question 56

In a use case,an external entity,called a(n)_____,initiates a use case by requesting the system to perform a function or process.

A) beneficiary
B) user
C) domain
D) actor

Question 57

A _____ is a command that tells an object to perform a certain method.

A) dictum
B) message
C) pledge
D) pronouncement

Question 58

The black box concept is an example of _____,which means that all data and methods are self-contained.

A) polymorphism
B) inheritance
C) encapsulation
D) use case modeling

Question 59

A class can belong to a more general category called a _____.

A) superclass
B) register
C) subclass
D) catalog

Question 60

An object can be viewed as a(n)_____,because a message to the object triggers changes within the object without specifying how the changes must be carried out.

A) black box
B) class diagram
C) use case
D) activity diagram

Question 61

In a sequence diagram,a _____ represents the time during which an object above it is able to interact with the other objects in the use case.

A) focus point
B) schematic matrix
C) validity link
D) lifeline

Question 62

A _____ shows how an object changes from one state to another,depending on events that affect the object.

A) state transition diagram
B) case tools diagram
C) scatter diagram
D) business process diagram

Question 63

For a use case diagram,the _____ shows what is included in the system and what is not included in the system.

A) system design
B) system boundary
C) system layout
D) system matrix

Question 64

For each use case,a _____ in the form of a table is developed to document the name of the use case,the actor,a description of the use case,and so forth.

A) use case description
B) use case diagram
C) use case schematic
D) use case outline

Question 65

A _____ is a visual summary of several related use cases within a system or subsystem.

A) use case description
B) use case diagram
C) use case schema
D) use case matrix

Question 66

Explain why tools are used in object modeling.

Question 67

A(n)_____ resembles a horizontal flowchart that shows the actions and events as they occur.

A) state transition diagram
B) sequence diagram
C) business model diagram
D) activity diagram

Question 68

Explain a class diagram.Also,explain how a class diagram is like a data flow diagram (DFD).

Question 69

Using the concept of polymorphism,define messages.

Question 70

The line from the actor to the use case is called a(n)_____.

A) association
B) aggregation
C) lifeline
D) observation

Question 71

_____ describes how instances of one class relate to instances of another class.

A) A modifier
B) A deliverable
C) Scope
D) Cardinality

Question 72

In a sequence diagram,a lifeline is identified by a _____ line.

A) solid
B) dashed
C) red
D) curved

Question 73

A _____ graphically documents a use case by showing the classes,the messages,and the timing of the messages.

A) state transition diagram
B) sequence diagram
C) data flow diagram
D) scatter diagram

Question 74

Define encapsulation using the black box concept.

Question 75

In a class diagram,each class appears as a(n)_____,with the class name at the top,followed by the class's attributes and methods.

A) rectangle
B) circle
C) oval
D) triangle

Question 76

What do relationships enable objects to do? What is the strongest kind of relationship? Walk through an example that demonstrates your understanding of the concept.