CH12

Question 1

________ is the process by which a set of detailed OO design models are built to be used for coding.

Answer 1

OO Design

Question 2

T/F: Design models are created in parallel to actual Coding/implementation with Iterative SDLC.

Answer 2

True.

Question 3

T/F: Agile approach says create models only if they are necessary.

Answer 3

True. Simple detailed aspects don’t need a design model before coding.

Question 4

_________ it is the creation of an object in memory based on the template provided by the class.

Answer 4

Instantiation

Question 5

_______ is the function executed within an object when invoked by a message request (method call).

Answer 5

Method

Question 6

Name the design model of the following:

Answer 6

Sequence Diagram

Question 7

Name the design model of the following:

Answer 7

Communication Diagram

Question 8

Name the design model of the following:

Answer 8

Class-Responsibility-Collaboration (CRC)

Question 9

_________ is the process to identify the classes, their methods and the messages required for a use case

Answer 9

Object-Oriented Design

Question 10

A design that is carried out use case by use case is said to be _________ driven

Answer 10

Use Case

Question 10

During an object-oriented design, __________ are used for simple use cases.

Answer 10

CRC Cards

Question 11

During an object-oriented design, __________ are used for moderately complext (medium) use cases.

Answer 11

Communication Diagram

Question 11

During an object-oriented design, __________ are used for complex use cases.

Answer 11

Sequence diagram

Question 12

___________ is a way of categorizing a model element by its characteristics, indicated by guillemots (&laquo_space;»).

Answer 12

Stereotype

Question 13

A _______________ is an class whose objects exist after a system is shut down (data remembered).

Answer 13

Persistent class

Question 14

__________ is a design identifier for a problem domain class (usually persistent.)

Answer 14

Entity class

Question 15

___________ is a class that exists on a system’s automation boundary, such as an input window form or Web page.

Answer 15

Boundary class or view class

Question 16

_________ is a class that mediates between boundary classes and entity classes, acting as a switchboard between the view layer and domain layer.

Answer 16

Controller class

Question 17

__________ is a class that is used to retrieve data from and send data to a database.

Answer 17

Data access class

Question 18

«________» , «________», «________», and «________» are the design class stereotypes.

Answer 18

entity, controller, boundary, dataAccess

Question 19

Describe the notation for a design class:

Answer 19

Question 20

__________ —indicates (+ or -) whether an attribute can be accessed directly by another object.

Answer 20

Visibility

Question 21

T/F: Attribute visibillity is usually public (+).

Answer 21

False, private (-) not public (+)

Question 21

-startingJobCode: integer = 01
01 is the _________.

Answer 21

Default value

Question 22

_______________ is the notation for a method, contains the information needed to invoke a method

Answer 22

Method Signature

Question 23

T/F: Methods cannot be private.

Answer 23

False, they can be private if invoked within the class like a subroutine.

Question 24

Class level method applies to class rather than objects of class (aka ______ method).

Answer 24

static

Question 25

Class level attribute applies to the class rather than an object (aka ______ attribute.)

Answer 25

static

Question 26

T/F: An abstract class can be instantiated.

Answer 26

False, a concrete class can be instantiated while an abstract class cannot.

Question 27

T/F: OO design is about assigning Responsibilities to Classes for how they Collaborate to accomplish a use case.

Answer 27

True.

Question 28

Designing with __________ is usually a manual process done in a brainstorming session.

Answer 28

CRC Cards

Question 29

In a CRC Card the front has _________ and _______, and the back has ________ needed.

Answer 29

responsibilities, collaborations, attributes.

Question 30

Name 4 fundamental design principles:

Answer 30

• Separation of responsibilites
• coupling
• cohesion
• protection from variations
• indirection

Question 31

Name the fundamental design principle: _____________ segregates classes into packages or groups based on primary focus of the classes.

Answer 31

Separation of Responsibilities

Question 32

Separation of Responsibilities is applied to a group of ________.

Answer 32

classes

Question 33

Name the fundemental design principle: __________ is the basis for multi-layer design - view, domain, data.

Answer 33

Separation of Responsibilities

Question 34

T/F: Seperation of Responsibilites facilitates multi-tier computer configuration.

Answer 34

True.

Question 35

Separation of Responsibilites is also known as __________.

Answer 35

Separation of Concerns

Question 36

Name the fundamental design principle: _________ is a design principle that states parts of a system unlikely to change are separated (protected) from those that will surely change.

Answer 36

Protection from Variations

Question 37

Name the fundamental design principle: _________ separates user interface forms and pages that are likely to change from application logic.

Answer 37

Protection from variations

Question 38

T/F: Protection from variations puts database connection and SQL logic that is likely to change in a separate classes from application logic.

Answer 38

True.

Question 39

Name the fundamental design principle: ____________ uses adaptor classes that are likely to change when interfacing with other systems.

Answer 39

Protection from Variations

Question 40

Name the fundamental Design Principles: _______________ is a design principle that states an intermediate class is placed between two classes to decouple them but still link them.

Answer 40

Indirection

Question 41

A controller class between UI classes and problem domain classes is an example of the ___________ principle of fundamental design principles.

Answer 41

Indirection

Question 42

T/F: Indirection does not support low coupling.

Answer 42

False, it supports low coupling.

Question 43

T/F: Indirection is used to support security by directing messages to an intermediate class as in a firewall.

Answer 43

True.

Question 44

Name the fundamental design princples: __________ is a qualitative measure of how closely related classes are linked (tightly or loosely coupled.)

Answer 44

Coupling

Question 45

Two classes are (tightly/loosely) coupled of there are lots of associations with another class.

Answer 45

tightly

Question 46

T/F: Two classes are tightly coupled if there are lots of messages to another class.

Answer 46

True.

Question 47

It is best to have classes that are _________ coupled.

Answer 47

loosely

Question 48

Name the fundamental Design Principle: _________ is a quantitative measure of the focus or unity of purpose within a single class (high or low cohesiveness.)

Answer 48

Cohesion

Question 49

One class has (high/low) cohesiveness if all of its responsibilities are consistent and make sense for purpose of the class (a customer carries out responsibilities that naturally apply to customers.)

Answer 49

high

Question 50

T/F: One class has low cohesiveness if its responsibilities are broad or makeshift.

Answer 50

True.

Question 51

It is best to have classes that are _______ cohesive.

Answer 51

highly