Deck 11: Object-Oriented Programming

Question 1

Which of the following is an accurate definition of the term object-oriented program?

A) An object-oriented program is a specific instance of a user-defined type.
B) An object-oriented program is an encapsulation of data and procedures that has properties and responds to methods.
C) An object-oriented program is populated with objects that hold data, have properties, respond to methods, and raise events.
D) An object-oriented program is a template from which objects are created.

Answer 1

C

Question 2

Which one of the following statements does NOT accurately describe object-oriented programs?

A) they are populated with objects that don't have properties
B) they are populated with objects that hold data
C) they are populated with objects that respond to methods
D) they are populated with objects that raise events

Answer 2

A

Question 3

Which of the following is an example of a control object?

A) string variable
B) array
C) primary key
D) list box

Answer 3

D

Question 4

Which procedure will set default values for member variables when an object is instantiated?

A) Form1_Load
B) Get property procedure
C) New
D) Set property procedure

Question 5

Control objects and code objects share many things in common. Which of the following statements applies only to control objects (in other words, which of the following statements does not apply to code objects)?

A) these objects have properties
B) these objects are predefined and have physical manifestations
C) these objects respond to methods
D) these objects are an encapsulation of data and procedures that act on the data

Question 6

An object can be created in the Declaration section of a form's Code editor with a pair of statements of the form.

Question 7

Get property procedures are used to retrieve values of member variables.

Question 8

Which statement form below carries out a method?

A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Question 9

Which of the following statements applies to code objects?

A) they are created from the Toolbox
B) they are predefined and have physical manifestations
C) they require the writing of a class block of code
D) they include objects of the type TextBox and ListBox

Question 10

A class specifies the properties and methods that will be common to all objects that are instances of that class.

Question 11

Which statement form below assigns a value to a property?

A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Question 12

Which of the following is an accurate definition of the term class?

A) A class is a specific instance of a user-defined type.
B) A class is an encapsulation of data and procedures that has properties and responds to methods.
C) A class is populated with objects that hold data, have properties, respond to methods, and raise events.
D) A class is a template from which objects are created.

Question 13

Member variables in a class are normally specified as Private.

Question 14

Set property procedures are used to assign values to member variables.

Question 15

Which line of code will declare and create an instance of a new object variable called instructor using a class called Faculty?

A) Dim Faculty As instructor
B) Dim instructor As Faculty
C) Dim Faculty As New instructor
D) Dim instructor As New Faculty

Question 16

Which one of the following statements does NOT apply to object-oriented programming?

A) Object-oriented programming helps to prevent the complete rewriting of a program every time a minor change needs to be made.
B) Object-oriented programming makes use of the principle of "data hiding."
C) Object-oriented programming makes use of the encapsulation within an object of data and procedures that act on the data.
D) Object-oriented programming depends on the programmer having access to and understanding all of the code that contains the data and procedures that are encapsulated within an object.

Question 17

Two instances of the same class may exist in a single program.

Question 18

Which statement form below assigns the value of a property to a variable?

A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Question 19

The New event procedure is automatically invoked when an object is instantiated.

Question 20

What is the purpose of the Get property procedure?

A) retrieve the value of a property
B) assign values
C) access private methods
D) verify the data

Question 21

Member or instance variables should not be accessed directly; instead, these variables are accessed indirectly through the use of a property block of code.

Question 22

A line of code that contains arguments and instantiates an object passes the value of these arguments to the object's New procedure.

Question 23

The constructor method requires at least one argument, and the code inside the procedure block performs any tasks needed for initializing an object.

Question 24

In the following statement, the word Private is used to guarantee that the variable cannot be accessed directly from outside the object.

Question 25

The lines of code used to create an instance of a class cannot be used inside of a procedure.

Question 26

The constructor method that is possessed by each class is used to set default values for member variables and to create other objects associated with this object.

Question 27

Each list box is said to be an instance of the class ListBox.

Question 28

The constructor method takes zero or more arguments, and the code inside the procedure block performs any tasks needed for initializing an object.

Question 29

In the following statement, the word m_name demonstrates the proper name for a member or instance variable. If these variables are declared without the prefix "m_", an exception will be thrown.

Question 30

A good rule of thumb for object-oriented programming is that classes are the verbs in your analysis of the problem.

Question 31

Methods can be either Sub or Function procedures.

Question 32

A line of code of the form Dim objectName As New className(arg1, arg2, ...) is used to instantiate an object variable or instance of an object.

Question 33

If member variables are declared as Private, they cannot be accessed directly from outside an object.

Question 34

An object is a template from which classes are created.

Question 35

The principle of "data hiding" is the exact opposite of the concepts that serve as the basis for object-oriented programming.

Question 36

Property blocks of code, that are used to access (indirectly) member or instance variables, must always contain both Get and Set property procedures.

Question 37

Each class has a special method called a constructor that is sometimes invoked when an object is instantiated.

Question 38

An object is an encapsulation of data and procedures that act on that data.

Question 39

Methods are constructed with a Function procedure when the method returns a value, and with a Sub procedure otherwise.

Question 40

Code objects are specific instances of a user-defined type, called a class.

Question 41

The statement for raising a user-defined event is located in the form's code and the event is dealt with in the class block of code.

Question 42

Which of the following best defines the term inheritance?

A) the process by which the properties, methods, and events of one class are passed onto another class
B) the collection of a parent class along with its descendants
C) when a member variable of class A makes use of an object of type class B
D) when one class manipulates or changes objects of another class

Question 43

The header for an event procedure for an instance of a class will be of the following type:

Question 44

Which of the following best defines the term hierarchy?

A) the process by which the properties, methods, and events of one class are passed onto another class
B) the collection of a parent class along with its descendants
C) when a member variable of class A makes use of an object of type class B
D) when one class manipulates or changes objects of another class

Question 45

Statements of which of the following kind should be placed in the form's code to declare an instance of a class that contains an event?

A) Public Event UserDefinedEvent(par1 As dataType1, par2 As dataType2, ...)
B) RaiseEvent UserDefinedEvent(arg1, arg2, ...)
C) Dim WithEvents object1 As ClassName
D) Private Sub object1_UserDefinedEvent(par1, par2, ...) _ Handles object1.UserDefinedEvent

Question 46

The statement for raising a user-defined event is located in the class block of code and the event is dealt with in the form's code.

Question 47

Statements of which of the following kind should be placed at locations in the class block code at which the event should be raised?

A) Public Event UserDefinedEvent(par1 As dataType1, par2 As dataType2, ...)
B) RaiseEvent UserDefinedEvent(arg1, arg2, ...)
C) Dim WithEvents object1 As ClassName
D) Private Sub object1_UserDefinedEvent(par1, par2, ...) _ Handles object1.UserDefinedEvent

Question 48

Which of the following terms does not describe a relationship between classes?

A) use
B) subclass
C) inheritance
D) containment

Question 49

In the hierarchy chart shown below, which of the following is GrandChild2 able to access?

A) Property A
B) Function E
C) Property D
D) Sub F

Question 50

Statements of which of the following kind should be placed in the Declarations section of a class code block?

A) Public Event UserDefinedEvent(par1 As dataType1, par2 As dataType2, ...)
B) RaiseEvent UserDefinedEvent(arg1, arg2, ...)
C) Dim WithEvents object1 As ClassName
D) Private Sub object1_UserDefinedEvent(par1, par2, ...) _ Handles object1.UserDefinedEvent

Question 51

Which of the following is an example of an array declaration whose data type is a user-defined object?

A) Dim students(50) As String
B) Dim students(50) As Student
C) Dim students(50) As Integer
D) Dim students(50) As TextBox

Question 52

The ___________ feature of Visual Basic allows certain types of property blocks to the written with neither a Get or a Set block?

A) default properties
B) self-implemented properties
C) auto-implemented properties
D) self-explanatory properties

Question 53

In the hierarchy chart shown below, GrandChild1 has access to each of the following items (as a result of inheritance), except one. Which of the following is GrandChild1 NOT able to access?

A) Property A
B) Property D
C) Event C
D) Sub B

Question 54

Which of the following is a benefit of inheritance?

A) Inheritance leads to the duplication of code in multiple classes.
B) Inheritance allows two or more classes to share some common features yet differentiate themselves on others.
C) Inheritance allows variables to be collected in arrays.
D) Inheritance allows Visual Basic programs to directly connect to databases.

Question 55

It can be said that class Student contains class College when a member variable of class Student makes use of an object of type class College.

Question 56

Which of the following statements best applies to the term user-defined events?

A) User-defined events represent specific instances of a user-defined type.
B) User-defined events are used to communicate changes of properties, errors, and the progress of lengthy operations.
C) User-defined events are predefined objects with physical manifestations.
D) User-defined events are populated with objects that hold data, have properties, respond to methods, and raise events.

Question 57

The keyword WithEvents is inserted into the standard declaration statement for instantiation of a class to allow the instance to respond to an event.

Question 58

Inheritance is the process by which the parent or base class inherits the properties, methods, and events of the child or derived class.

Question 59

Inheritance does not enhance code reusability.

Question 60

In the following code block, which of the following represents the line of code that assigns the value of the Name property?
Class Student
Private m_name As String
Public Property Name As String
Get
Return m_name
End Get
Set(Value As String)
m_name = Value
End Set
End Property
End Class

A) End Class
B) m_name = Value
C) Return m_name
D) Private m_name As String

Question 61

The feature that two classes can have methods with different names but that have the same purpose (and essentially the same implementation), is known as polymorphism.

Question 62

The programmer needs to be able to identify useful hierarchies of classes and derived classes in working with object-oriented programming.

Question 63

In inheritance, the keyword Overrides is used to designate the parent's methods that are overridden by its children.

Question 64

The ISA test is one guideline used in determining when and how to establish a hierarchy. It posits that if one class is a more specific case of another class, then it should be derived from that other class.

Question 65

In inheritance, the keyword Overridable is used to designate the parent's methods that may be overridden by its children.

Question 66

The class interface is a set of properties, methods, and events that define how the class should behave.