Deck 12: OOP: Creating Object-Oriented Programs

Question 1

When you add a class module to a project,any form in the same project will automatically recognize the class properties,methods,and events.

Answer 1

False

Question 2

In a multitier application,the Presentation tier refers to the user interface.

Answer 2

True

Question 3

Inheritance is the ability to create a new class from an existing class.

Answer 3

True

Question 4

Forms are inherited from System.Windows.Forms.Form class.

Question 5

Declaring a variable for a class object sets up the memory location for the new object,but it does not actually create the object.

Question 6

A new class is created by choosing Add Module from the Project menu.

Question 7

A button on a form is an instance of the Button class.

Question 8

Microsoft recommends writing a Finalize procedure,a destructor,when an object goes out of scope.

Question 9

Property procedures are Public by default,so you can omit the optional Public keyword at the beginning of the Property procedure.

Question 10

To accomplish encapsulation,you must declare all variables in a class as Public.

Question 11

Objects have properties and methods.

Question 12

The middle tier,the Business tier,can be stored in a location other than where the Presentation tier is stored.

Question 13

The garbage collection feature releases memory and system resources used by unreferenced objects.

Question 14

Creating a class module defines a new class;it does not create any objects.

Question 15

Shared variables and instance variables are the same.

Question 16

The value of a property in a class module can be retrieved through the Get accessor method in the Property procedure.

Question 17

The acronym OOP stands for Object-Oriented Procedures.

Question 18

The Set accessor method in a Property procedure retrieves the value of a property from a class.

Question 19

Properties are actions that can be performed by a class of objects.

Question 20

When you have finished defining a class,you may then create as many instances of the class as you need using the New keyword.

Question 21

The _______ tier should contain the calculations that handle the data.

A)Class tier
B)Presentation tier
C)Data tier
D)Business tier

Question 22

A _______ is a method that automatically executes when an object is instantiated.

A)constructor
B)destructor
C)overloaded method
D)derived class

Question 23

Which of the following statements about class modules is NOT true?

A)Class modules only contain a code window.
B)Class modules can contain a code window and a form window.
C)Class modules contain Property procedures that have Get and/or Set accessor methods.
D)Class modules must be instantiated in order to be available to a project.

Question 24

Which of the following is NOT true?

A)A constructor can be written without any arguments.
B)A constructor can contain multiple arguments.
C)Writing a constructor for a class module is not required.
D)Constructors begin with the code,"Public Sub Constructor()".

Question 25

_______ refers to the combination of characteristics of an object along with its behaviors in a single definition.

A)Reusability
B)Inheritance
C)Encapsulation
D)Polymorphism

Question 26

You can use visual inheritance by designing one form and then inheriting any other forms from the first.

Question 27

The Get accessor method _______.

A)retrieves the current value of a property
B)allows you to get items from a listbox
C)allows a class to set its properties
D)returns the hidden enumerator

Question 28

Property procedures are _______ by default.

A)Local
B)Module-level
C)Private
D)Public

Question 29

Get and Set accessor methods must be _______ in order to allow other modules (forms or classes)to assign and retrieve their values.

A)Functions
B)Strings
C)Public
D)Private

Question 30

When you create a method with the same name and the same argument list as a method in the base class,the new method is said to override the base-class method.

Question 31

Add a class module to a project by _______.

A)selecting Add Class from the Project menu
B)right-clicking on the project name and selecting Properties
C)clicking on a Class object in the Toolbox
D)right-clicking on the user interface and selecting Add Class from the menu

Question 32

When methods have the same name,but a different list of arguments,it is called _______.

A)overriding
B)sharing
C)overloading
D)instantiation

Question 33

A class allows its properties to be retrieved through _______.

A)a Let block
B)a Get accessor method
C)a Set accessor method
D)the New keyword

Question 34

A big advantage of OOP over traditional programming is _______.

A)the objects are all declared Public
B)the ability to reuse classes
C)the convenience of giving all objects in a project the same name
D)none of these

Question 35

A derived class can inherit all public and protected members and methods of the base class,but it cannot inherit constructors from the base class.

Question 36

The acronym OOP stands for _______.

A)Object-Ordering Programs
B)Other-Object Procedures
C)Object-Organized Projects
D)Object-Oriented Programming

Question 37

_______ refers to data hiding.

A)Encapsulation
B)Instantiation
C)Inheritance
D)Polymorphism

Question 38

You can create a new class based on one of the existing VB classes or from one of your own classes.

Question 39

In a multitier application,which tier contains the user interface?

A)The Presentation tier
B)The Business tier
C)The Data tier
D)The Class tier

Question 40

A constructor that requires arguments is called _______.

A)a Public constructor
B)a destructor constructor
C)a Sub New constructor
D)a parameterized constructor

Question 41

Give an explanation of each of the following OOP features: Encapsulation,Inheritance,and Polymorphism.

Question 42

The destructor method automatically executes _______.

A)when an object goes out of scope
B)when an object is destroyed
C)when an object is created
D)Answers A and B are correct.

Question 43

The quickest and most reliable way to look up the names of objects,properties,methods,events,and constants for Visual Basic objects is by using the _______.

A)toolbox
B)Class module
C)Object Browser
D)enumerator

Question 44

You can create forms that look similar by using _______.

A)derived methods
B)constructors
C)the Overridable keyword
D)visual inheritance

Question 45

Which of the following is NOT true?

A)A separate memory location exists for each instance of a class.
B)Shared variables are available for all objects of a class.
C)Shared members can be accessed without instantiating an object of the class.
D)Instance members can be used as counters or accumulators.

Question 46

Write the code to create a shared member that will accumulate the total of all sales.

Question 47

Write the code for a parameterized constructor that assigns the values to the FirstName and LastName properties in the class.

Question 48

How do you create properties in a class? Write the code needed to create a property called MyName and include code for Get and Set accessor methods.

Question 49

When using inheritance,you can call the base class constructor with this code: _______.

A)BaseClass.Inherit()
B)Inherit.Base()
C)MyBase.New()
D)New.BaseClass()

Question 50

Which of the following is NOT true?

A)The code,"Private TheBookSale As BookSale()" creates an object.
B)The code,"Dim TheBookSale as New BookSale()" creates an object.
C)Button is a class.
D)A button created from the toolbox and named,ExitButton,is an object.

Question 51

To override a method,you must declare the original method with the _______ keyword and declare the new method with the Overrides keyword.

A)Overridable
B)Inherits
C)Derived
D)Inheritance