Deck 12: Object-Oriented Design: Fundamentals

Question 1

​One type of design class stereotype is called a "concrete class" because it can be instantiated.

Answer 1

False

Question 2

​In object-oriented design,the design models are extensions of the analysis models.

Answer 2

True

Question 3

​A "persistent" class is sometimes referred to as an "entity" class.

Answer 3

True

Question 4

An object-oriented program consists of a set of object classes that work together to process an input message.

Question 5

​The only difference between a domain class diagram and a design class diagram is the addition of the methods.

Question 6

​One tenet of Agile philosophy is that while analysis models may be useful,it generally is not necessary to develop design models.

Question 7

​Visibility is a design property that indicates whether a class can be "seen" by the user interface classes.

Question 8

​Detailed Object-oriented design (OOD)is done on a use case-by-use case basis.

Question 9

​The first step in object-oriented design is to develop the design class diagram.

Question 10

One popular standard UML model that is used for object-oriented design is through the use of CRC Cards.

Question 11

​Both a communication diagram and a sequence diagram have the same purpose and provide basically the same information.

Question 12

The objective of object-oriented design is to identify and specify all the classes and messages that work together to carry out each use case.

Question 13

​It is usually a bad idea to try to include user-interface classes to a CRC design.

Question 14

The primary difference between the first-cut design class diagram and the final design class diagram is the addition of method signatures.

Question 15

​Attributes within a property class can have their own properties.

Question 16

The objective of object-oriented analysis is to identify the objects that must work together to carry out each use case.

Question 17

​In the design of a complex use case,both a communication diagram and a sequence diagram may be needed.

Question 18

​The design models that are useful for modeling the flow of execution are Communication diagrams,Sequence diagrams,and Activity diagrams.

Question 19

​The primary difference between a design class symbol and a problem domain class symbol is the addition of method signatures.

Question 20

​Developers do not typically add more classes to design class diagrams than were originally defined in the domain model.

Question 21

​Cohesion is a measure of how well the system "hangs together" by having strong connections between classes.

Question 22

A one-to-many relationship means that a foreign key is placed in the "many" class,which gives navigation visibility from the "many" class to the "one" class.

Question 23

​In order for an object to send a message to another object it must have navigation to that object.

Question 24

​Which two models are primary models in object-oriented detailed design?

A)Design class diagram and component diagram
B)​Package diagram and CRC cards
C)Sequence diagram and communication diagram
D)​Sequence diagram and design class diagram

Question 25

​Which analysis model serves as an input model to a design class diagram?

A)Use case diagram
B)​Activity diagram
C)Domain model class diagram
D)​System sequence diagram (SSD)

Question 26

​Which of the following is NOT part of a multilayer object-oriented design (OOD)?

A)Database access
B)​Problem domain object
C)User input form
D)​Functional module

Question 27

Which diagram is directly used to identify methods and write programming code for object-oriented systems?

A)Sequence diagram
B)​Design class diagram
C)Package diagram
D)​State-machine diagram

Question 28

​In Unified Modeling Language (UML)notation,a stereotype is indicated by ____.

A)parentheses
B)​brackets
C)guillemets
D)​underline

Question 29

​A(n)____ class acts as a switchboard between the view layer and the domain layer.

A)boundary
B)​controller
C)entity
D)​persistent

Question 30

​Which of the following is included in the top compartment of a design class?

A)Attributes
B)​Parameter list
C)Type-expression
D)​Stereotype name

Question 31

​An input window class is an example of a(n)____ design class type.

A)boundary
B)​control
C)entity
D)​persistent

Question 32

​In generalization/specialization the attributes (but not the associations)of the subclass are inherited from the superclass.

Question 33

​High coupling is usually better than low coupling because it makes the system more integrated.

Question 34

​A class level attribute applies to all instances of a class.

Question 35

​CRC stands for Class-Responsibility-Communication.

Question 36

​Which of the following is NOT one of the design models used for object-oriented design.

A)Communication diagram
B)​System sequence diagram
C)CRC cards
D)​Design class diagram

Question 37

​Separation of responsibilities is the basic principle upon which multilayer design is founded.

Question 38

​Design using CRC cards does not require the use of a design class diagram.

Question 39

​Navigation visibility may be bidirectional.

Question 40

​Object responsibility is important because it helps to decide what methods are assigned to what classes.

Question 41

​A class that is responsible for accessing both the Internet and a database has ____ cohesion.

A)very low
B)​low
C)medium
D)​high

Question 42

​A Web based application that integrates HTML code with business logic is said to be in violation of what design principle?

A)Object responsibility
B)​Indirection
C)Protection from variations
D)​Coupling

Question 43

​Which of the following is true of class-level methods?

A)They depend on the existence of a particular object.
B)​They cannot access data across all objects.
C)They are executed by the class instead of a specific object of the class.
D)​There can only be one class method per class.

Question 44

​In design class notation,the ____ of an attribute is enclosed in curly braces {}.

A)visibility
B)​type-expression
C)initial-value
D)​property

Question 45

​If a class is reusable,that is to say that it can be used in several different applications,then it has been designed using what good design principle?  An example might be a button class.

A)Separation of concerns
B)​Object responsibility
C)Low coupling
D)​High cohesion

Question 46

​In a design class diagram,navigation visibility is identified by ____.

A)a solid arrow between the classes, pointing to the visible class
B)​a solid arrow between the classes, initiating from the visible class
C)a dashed arrow between the classes, pointing to the visible class
D)​a solid line between the classes

Question 47

​Which of the following is the best coupling choice for an input window,domain,and database object in a system?

A)The input window is coupled to both the domain and database objects.
B)​The input window is coupled to the domain and the domain is coupled to the database.
C)The input window and the domain are both coupled to the database object.
D)​All objects are coupled to each other.

Question 48

​Which of the following is valid Unified Modeling Language (UML)notation for a method signature?

A)visibility name:type-expression {parameter list}
B)​name:class-name (parameter list):type-expression
C)visibility name(parameter list):type-expression
D)​visibility class-name:name:type-expression {parameter list}

Question 49

​High coupling ____ in a system.

A)is easier to maintain
B)​reduces ripple effects in a system when changes occur
C)adds complexity
D)​decreases visibility between classes

Question 50

​UML provides a technique to extend the standard UML notation to include new symbols. This technique is called ________.

A)extending
B)​stereotyping
C)prototyping
D)​externalizing

Question 51

​After completing a use-case design using CRC cards,the next step is to _______.

A)add required utility classes
B)​select another use case
C)program the use case
D)​update the design class diagram

Question 52

​Given two classes,customer and order,which class would probably have navigational visibility to which class?

A)Cannot determine based on the information provided
B)​Bidirectional -- each has visibility to the other
C)Order to Customer
D)​Customer to Order

Question 53

​Which of the following is a general guideline for designing navigation visibility?

A)A superior/subordinate relationship is usually navigated from the superior to the subordinate class
B)​A superior/subordinate relationship is usually navigated from the subordinate to the superior class
C)Relationships in which objects in one class cannot exist without objects of another class are usually navigated from the more dependent class to the more independent class
D)​Navigation arrows should not be modified during the design process

Question 54

​CRC stands for what?

A)Collaboration responsibility card
B)​Class responsibility collaboration
C)class relationship collaboration
D)​collaboration relationship class

Question 55

​____ is a qualitative measure of the consistency of functions within a single class.

A)Cohesion
B)​Encapsulation
C)Coupling
D)​Visibility

Question 56

​Which of the following is correct UML notation for an attribute in a design class?

A)visibility name:type-expression = initial-value{property}
B)​visibility class-name:type-expression {property}
C)visibility name:initial-value(property)
D)​visibility name:type-expression initial-value (property)

Question 57

​Which of the following is usually NOT included in a first-cut design class diagram?

A)Initial value information for attributes
B)​Attribute types
C)Method signatures
D)​Navigation visibility arrows

Question 58

​If you are doing detailed design for the use case Create New Order,which class should receive the first input?

A)Order Transaction
B)​Order
C)Order Handler
D)​Customer

Question 59

​A plugin,such as adobe PDF reader,that is attached to a browser,such as Firefox,is a good example of what design principle?

A)Separation of concerns
B)​Protection from Variations
C)Indirection
D)​Good cohesion

Question 60

​A class named SaleItem which has methods to calculate its own price is said to have good ______.

A)API
B)​cohesion
C)coupling
D)​object responsibility

Question 61

​The term "_______" is a measure of the focus or unity of purpose within a single class.

Question 62

​What is the term to denote a method that is invoked on a class instead of on an object?

Question 63

​What is the term used to define the characteristic of an object attribute that describes whether it can be directly accessed by another object -- denoted by + or - ?

Question 64

​A(n)_______  ______ class is a class that is used to retrieve data from a database.

Question 65

​What do we call the notation that shows all the information required to call or invoke a method?

Question 66

​The general term that refers to the process to identify the set of classes,their methods and the messages to execute a use case is called ______ ______ ______.

Question 67

​What term is used to describe a design principle in which an intermediate class is placed between two classes to decouple them but still link them?

Question 68

​When an object receives a message,a(n)_______,which is a small segment of program logic,receives the message and processes it.

Question 69

​A class that can be instantiated with objects of its type being created is called a(n)______ _____.

Question 70

​The term used to identify an attribute that contains the same value for all objects of this type in the system is _______.

Question 71

​A(n)_______ class is one where its objects exist after the system is turned off.

Question 72

​The main purpose of a(n)______  ______ diagram is to document and describe the programming classes that will be built for the new system.

Question 73

​What is the term that is used to describe a design principle in which parts of a system that are unlikely to change are segregated from those that will?

Question 74

​Which of the following are information items on CRC cards. (Choose two)

A)Object names
B)​Method signatures
C)Attributes
D)​Stereotypes
E)​Interactions
F)Responsibilities

Question 75

​The term "______ ______"  is a design principle in which one object has reference to another object and can thus interact with it.

Question 76

​A class that can never have objects of its type created is called a(n)______ ______.

Question 77

​The creation of a programming object based on the template provided by the class definition is called _______.

Question 78

​A design principle in which objects are responsible for carrying out system processing is called ______ ______.

Question 79

​A brainstorming technique for designing interactions in use cases by assigning responsibilities and collaborations for classes is called _______ ______ .

Question 80

​Which is a valid sequence of modeling steps for designing a use case?

A)Choose use case, CRC cards, Final DCD, package diagram
B)​Sequence diagram, DCD, State chart diagram, Package diagram
C)First cut DCD, CRC cards, package diagram, Final DCD
D)​First cut DCD, Communication diagram, Final DCD, Package Diagram