CSS 331 - Exam II Review: Chapter 10

¡Supera tus tareas y exámenes ahora con Quizwiz!

True

(T/F) A Private variable in a class can be access directly by a Public method in the same class. a. True b. False

False

(T/F) A ReadOnly property can be an auto-implemented property. a. True b. False

True

(T/F) A WriteOnly property can be an auto-implemented property. a. True b. False

True

(T/F) One of the disadvantage of using Public variables in a class is that a class cannot control the values assigned to its Public variables. a. True b. False

True

(T/F) Private variable in a class can be accessed directly by a Public method in the same class. a. True b. False

Get statement

appears in a Get block in a Property procedure; contains the code that allows an application to retrieve the contents of the Private variable associated with the property

Set statement

appears in a Set block in a Property procedure; contains the code that allows an application to assign a value to the Private variable associated with the property; may also contain validation code

Public property procedure

creates a Public property that an application can use to access a Private variable in a class

Class statement

the statement used to define a class in Visual Basic

Member variables

the variables declared in the attributes section of a class

Overloaded methods

two or more class methods that have the same name but different parameterLists

WriteOnly keyword

used when defining a Property procedure; indicates that an application can only set (write to) the property's value

ReadOnly keyword

used when defining a Property procedure; indicates that the property's value can only be retrieved (read) by an application

Instantiated

the process of creating an object from a class

Get block

the section of a Property procedure that contains the Get statement

Set block

the section of a Property procedure that contains the Set statement

Class

A ________ can have only one default constructor.

ParameterList

A class can have as many parameterized constructor as needed, but each ________________ lmust be unique.

State = strName

A class contains a Private variable named strState. The variable is associated with a Public property name State. Which of the following is the best way for a parameterized constructor to assign the value stored in its strName parameter to the variable? a. strState = strName b. State = strState c. strState = State.strName d. State = strName

_Title = "Unknown"

A class contains an auto-implemented property name Title. Which of the following is the correct way for the default constructor to assign the string "Unknown" to the variable associated with the property? a. _Title = "Unknown" b. _Title.strTitle = "Unknown" c. Title = "Unknown" d. None of the Above

a Sub procedure

A constructor is _____________. a. a function b. a Property procedure c. a Sub procedure d. either a function or a Sub procedure

Default parameter

A constructor that has no parameters is called _______________.

Parameterized

A constructor that has one or more parameters is called a ______________ constructor.

constructor

A(n) ____ is a class method whose sole purpose is to initialize the class's Private variables. a. signature b. constructor c. Get block d. event

Sub, New

All constructors are _____ procedures that are named ________.

parameterized constructors

Constructors that contain parameters are called _______. a. attributes b. default constructors c. Set blocks d. parameterized constructors

Private

To hide one of a class's member, you declare the member using which of the following keywords? a. Hide b. Invisible c. Private d. ReadOnly

using properties created by Public Property procedures

How can an application access the Private variables in a class? a. directly b. using properties created by Public Property procedures c. Through Private procedures contained in the class d. None of the Above

Set

If you need to validate a value before assigning it to a Private variable, you enter the validation code in which block in a Property procedure? a. Assign b. Get c. Set d. Validate

Get

In a Property procedure, the code contained in the ________ block allows an application to retrieve the contents of the Private variable associated with the property. a. Set b. Assign c. New d. Get

New

Which of the following is the name of the Inventory class's default constructor? a. Inventory b. InventoryConstructor c. Default d. New

Behaviors

an object's methods and events

onHand.ItemId = "XG45"

The Inventory class contains a Private variable named strId. The variable is associated with the Public ItemId property. An application instantiates an Inventory object and assigns it to a variable named onHand. Which of the following can be used by the application to assign the string "XG45" to the strId variable? a. onHand.ItemId = "XG45" b. ItemId.strId = "XG45" c. onHand.strId = "XG45" d. ItemId.strId = "XG45"

dblDiscount = cellPhone.GetDiscount

The Item class contains a Public method named GetDiscount. The method is a function. An application instantiates an Item object and assigns it to a variable named cellPhone. Which of the following can be used by the application to invoke the GetDiscount method? a. dblDiscount = Item.GetDiscount b. dblDiscount = cellPhone.GetDiscount c. dblDiscount = GetDiscount.cellPhone d. cellPhone.GetDiscount

intNewPrice = Price.GetNewPrice

The Product class contains a Private variable named _intPrice. The variable is associated with the Public Price property. An application instantiates a Product object and assigns it to a variable named item. The Product class above contains a Public method named GetNewPrice. The method is a Function procedure. Which of the following can be used by the application above to invoke the GetNewPrice method? a. intNewPrice = Call GetNewPrice b. intNewPrice = Price.GetNewPrice c. intNewPrice = item.GetNewPrice d. intNewPrice = item.GetNewPrice(item._intPrice)

lblTax.Text = currentSale.Tax.ToString("C2")

The Purchase class contains a Read Only property named Tax. The property is associated with the Private dblTax variable. A button's Click even procedure instantiates a Purchase object and assigns it to the currentSale variable. Which of the following is valid in the Click procedure? a. lblTax.Text = currentSale.Tax.ToString("C2") b. currentSale.Tax = 15 c. currentSale.Tax = dblPrice * 0.05 d. None of the Above

Get

The Return statement is entered in which statement in a Property procedure? a. Get b. Set

Object

anything that can be seen, touched, or used

constructor

The instructions of a ________ are automatically processed each time an object is instantiated from the class. a. structure b. designer c. loader d. constructor

signature

The method name combined with the method's optional parameterList is called the method's _____________. a. autograph b. inscription c. signature d. statement

.vb

The name of a class file ends with which of the following filename extensions? a. .cla b. .cls c. .vb d. None of the Above

auto-implemented

To specify the property of a class in one line, create an ____________________ property using syntax shown in Figure 10-27 in the textbook.

overloaded

Two or more methods that have the same name but different parameterLists are referred to as what type of methods? a. loaded b. overloaded c. parallel d. signature

Dim chair As New Inventory

Which of the following instantiates an Inventory object and assigns it to the 'chair' variable? a. Dim chair As Inventory b. Dim chair As New Inventory c. Dim chair = New Inventory d. Dim New chair As Inventory

Events

the actions to which an object can respond

ReadOnly

To create a property whose value an application can only retrieve, include the ____________ keyword in the Property procedure's header.

WriteOnly

To create a property whose value an application can only set, include the ___________ keyword in the Property procedure's header.

Giving them the same name but different parameterLists

To create two or more methods that perform the same task but require different parameters, overload the methods by ____________________________.

Public

To expose a variable or method contained in a class, you declare the variable or method using the keyword ___________. a. Exposed b. Private c. Public d. Viewable

Attributes

the characteristics that describe an object

None of the Above

Which of the following is the name of the Animal class's default constructor? a. Animal b. AnimalConstructor c. Default d. None of the Above

A class can contain only one constructor

Which of the following statements is False? a. A class can contain only one constructor b. An example of a behavior is the SetTime method in a Time class c. An object created from a class is referred to as an instance of the class d. An instance of a class is considered an object

inheritance

You can create one class from another class. In OOP, this is referred to as ________. a. encapsulation b. overloading c. overriding d. inheritance

Parameterized constructor

a constructor that contains one or more parameters

Default constructor

a constructor that has no parameters; a class can only have one default constructor

Constructor

a method whose instructions are automatically processed each time the class is used to instantiate an object; used to initialize the class's Private variables; always a Sub procedure named New

Signature

a method's name combined with its optional parameterList

Class

a pattern that the computer follows when instantiating (creating) an object

Object-Oriented Programming language

a programming language that allows the use of objects in an application's interface and code

Encapsulates

an OOP term that means "contains" in a class

Instance

an object created from a class

Hidden

in OOP, this term refers to the fact that an object's Private members are not visible to an application

Exposed

in OOP, this term refers to the fact that an object's Public members are visible to an application

Auto-Implemented properties

the Visual Basic feature that enables you to specify the property of a class in one line

OOP

the acronym for object-oriented programming

Methods

the actions that an object is capable of performing


Conjuntos de estudio relacionados

Cell division Homework #1 - Mrs.Brya

View Set

Chapter 7 A&P in class assignment

View Set

Chapter 10 Understanding Work Teams

View Set

Test 2 Fundamentals of Marketing and Technology

View Set