Deck 11: Multiple Classes and Inheritance

Question 1

In a three-tier architecture,the business tier contains the ____ that must occur to fulfill the requirements of the program.​

A)​logic
B)​objects
C)​syntax
D)​calculations

Answer 1

A,D

Question 2

The ____ tier is a tier within the three-tier structure into which programs are divided.​

A)​Presentation
B)​Records
C)​Business
D)​Persistence

Answer 2

A,C,D

Question 3

The ____ property should be tested to ensure that a masked textbox contains characters for the entire mask area.​

A)​MaskRange
B)​MaskFull
C)​MaskComplete
D)​CompleteMask

Answer 3

B

Question 4

The code in a constructor procedure executes after any other code in the object._________________________

Question 5

Concatenation is a major contributor to reliable and robust programs._________________________​

Question 6

The SelectedIndex property of a ComboBox object will contain the value ____ if a selection has been made.​

A)​-1
B)​0
C)​of the entry
D)​True

Question 7

____ is a major contributor to reliable and robust programs.​

A)​Resolution
B)​Concatenation
C)​Encapsulation
D)​Identification

Question 8

In a three-tier architecture,only the persistence classes will actually ____ data.​

A)​record
B)​read
C)​index
D)​write

Question 9

In a three-tier architecture,the ____ tier contains the classes that display information and accept user input.​

A)​validation
B)​presentation
C)business​
D)​persistence

Question 10

Use the ____ function to test an input value to ensure that it is numeric.​

A)​IsNumber
B)​IsNumeric
C)​TestNumber
D)​TestNumeric

Question 11

The WriteLine procedure will ____.​

A)​write a record to a file
B)​place a line return in the file
C)​update an existing record in a file
D)​close a StreamWriter

Question 12

​
To specify the sequence of objects (like those in the accompanying figure)that will be selected when the TAB key is pressed,the ____ property is used.​

A)​TabIndex
B)​TabOrder
C)​SelectedIndex
D)​SelectedItem

Question 13

A subclass is always in a "has-a" relationship with the base class._________________________​

Question 14

The TabIndex property determines which object on a form receives the focus when the user presses the ____ key.​

A)​ALT
B)​SPACEBAR
C)​TAB
D)​BACKSPACE

Question 15

The MaskFull property will return a value of ____ if the mask area of a masked textbox is not completely filled.​

A)​True
B)​False
C)​0
D)​-1

Question 16

In a three-tier architecture,only the presentation tier will actually read and write data.​

Question 17

Inheritance allows one class to gain ____ from another class.​

A)​attributes
B)​records
C)​procedures
D)​bases

Question 18

To use a three-tier structure for a program,you must divide the processing into ____.​

A)​baselines
B)​indices
C)​classes
D)​references

Question 19

Data access tier is another name for the presentation tier._________________________​

Question 20

In a ComboBox object,the SelectedIndex property will contain a value of ____ if no selection has been made.​

A)​-1
B)​0
C)​1
D)​null

Question 21

In a three-tier architecture,the classes in the ____ tier generally use data entered by users and data obtained from storage.​

A)​processing
B)​persistence
C)​presentation
D)​business

Question 22

Data that is stored in a file or database on disk often is called ____ data.​

A)​persistent
B)​extant
C)​resistant
D)​existing

Question 23

The ____ tier is also called the data access tier in a three-tier architecture.​

A)​presentation
B)​business
C)​persistence
D)​data processing

Question 24

The ____ tier implements the "business rules" required for the application.​

A)​business
B)​data access
C)​data processing
D)​rules

Question 25

If the developer writes no code for a class ____,Visual Basic automatically generates any processing that must be accomplished to prepare the object for use.​

A)​builder
B)​constructor
C)​creator
D)​instantiator

Question 26

In a three-tier architecture for Web applications,the ____ tier contains the Web page that appears to the user.​

A)​business
B)​interface
C)​persistence
D)​presentation

Question 27

The ____ statement can be used to instantiate an object from a class.​

A)​Create
B)​CreateObject
C)​Instantiate
D)​New

Question 28

Whenever inheritance is used,the subclass must fit into a(n)____ relationship with the base class.​

A)​equivalence
B)​"has-a"
C)​helper
D)​"is-a"

Question 29

​In a three-tier architecture,the ____ tier contains the logic and calculations.

A)​business
B)​persistence
C)​presentation
D)​validation

Question 30

The processing in the ____ tier ensures that valid data is entered into the program for processing in the business tier.​

A)​validation
B)​presentation
C)​business
D)​persistence

Question 31

____ is the concept of separating processing and hiding data within specific classes.​

A)​Encapsulation
B)​Inheritance
C)​Object-oriented programming
D)​Persistence

Question 32

Data that is ____ remains after the program is terminated.​

A)​extant
B)​legacy
C)​lingering
D)​persistent

Question 33

The ____ prepares an object for use in the program.​

A)​constructor
B)​class variable
C)​class declaration
D)​destructor

Question 34

​A subclass inherits attributes from a(n)____ class.

A)​inheriting
B)​disseminating
C)​distributing
D)​base

Question 35

The ____ keyword is used to declare a variable that will contain the address of an object created from a class.​

A)​Dec
B)​Const
C)​Dim
D)​Set

Question 36

When a class is ____ into an object using the New keyword,a special procedure called a constructor is executed in the class.​

A)​encapsulated
B)​inherited
C)​instantiated
D)​constructed

Question 37

​The code in a(n)____ procedure executes before any other code in an object.

A)​beginner
B)​builder
C)​constructor
D)​instantiation

Question 38

When designing a program using the three-tier approach,a primary rule is that classes in the presentation tier can communicate only with classes in the ____ tier.​

A)​business
B)​data access
C)persistence​
D)​validation

Question 39

When an object requires data when it is instantiated,the data can be passed as part of the ____ code.​

A)​encapsulation
B)​inheritance
C)​instantiation
D)​declaration

Question 40

Which of the following contains the correct code to create and instantiate an object named MyStudent from a class named Student?​

A)​Dim objStudent As Student
B)​Dim objStudent As New Student
C)​Dim objStudent = Student
D)​Dim objStudent = New Student

Question 41

When using inheritance,the class that provides attributes to be inherited is called the ____ class.​

A)​inheriting
B)​base
C)​distributing
D)​disseminating

Question 42

The presentation tier of the three-tier structure consists of one or more forms and the objects placed on the forms.​

Question 43

A ____ text file can be read into programs such as Microsoft Excel and Microsoft Access to import the data into the application.​

A)​comma-delimited
B)​case
C)​streamed
D)​delimiter written

Question 44

​In a three-tier architecture,the business classes should not be concerned with the functionality of the user interface.

Question 45

A new class can be added to an application by pressing and holding,or right-clicking,the project name in the Solution Explorer window.​

Question 46

____ the text means writing the next record in the file following the last record currently in the file.​

A)​Integrating
B)​Coding
C)​Executing
D)​Appending

Question 47

A class can only be used in one program for one purpose.​

Question 48

The business tier of a three-tier architecture contains the code required to read and write data from permanent storage.​

Question 49

A class that inherits attributes from another class is called a(n)____.​

A)​ascendant
B)​base class
C)​inheritor
D)​subclass

Question 50

A procedure in a subclass that has the same name as a procedure in its base class must be declared in the subclass with the ____ keyword.​

A)​Overridable
B)​Overrides
C)​Replaceable
D)​Replaces

Question 51

A comma separates each field in a record in a comma-____ file.​

A)​persistent
B)​tiered
C)​delimited
D)​based

Question 52

Both a base class and its subclass must have ____.​

A)​constructors
B)​objects
C)​libraries
D)​glossaries

Question 53

To ensure that variables declared in a base class may be accessed by its subclasses but not by other classes,the variables should be declared with ____ access.​

A)​Private
B)​Protected
C)​Public
D)​Restricted

Question 54

A constructor procedure is identified by the keyword ____.​

A)​Con
B)​Create
C)​Constr
D)​New

Question 55

In a three-tier architecture,user interface classes should not be concerned with how the data is manipulated by the business classes.​

Question 56

In a three-tier architecture for a web application,the web form and web page constitute the persistence tier.​

Question 57

An object acts as a template for a class.​

Question 58

In a three-tier architecture,the user interface classes should have nothing to do with how data is validated.​

Question 59

Which tier is involved in saving data stored on a USB drive?​

A)​persistence
B)​business
C)​override
D)​constructed

Question 60

Validation of user input data should occur in the business tier of a three-tier architecture.​

Question 61

The TabIndex property of objects on a Windows form controls the order that objects will be selected when the user presses the ____________________ key.​

Question 62

To determine if a selection was made in a combo box,the value of the ____________________ property should be tested.​

Question 63

You must instantiate an object based on a class in order for the processing in the object to take place.​

Question 64

When a subclass is instantiated,only the subclass's constructor is executed.​

Question 65

When arguments are passed ByVal,it means the original value is passed to the instantiated object and a copy of the value is not used.​

Question 66

Generally,when using multiple classes within a program,variables in a class should not be available to code within other classes within the program.​

Question 67

If the developer writes no code for a class constructor,Visual Basic automatically generates whatever processing must be accomplished to prepare the object for use.​

Question 68

To call a procedure in another object,a statement in the calling object must identify both the object and the procedure within the object.​

Question 69

When using inheritance,a subclass cannot use the procedures within the base class.​

Question 70

Statements outside a base class and its subclasses can reference variables declared in the base class with Protected access.

Question 71

​
The ____________________ tier consists of one or more forms like the one in the accompanying figure.​

Question 72

The subclass can use attributes from the base class as if those attributes were defined in the subclass.​

Question 73

A constructor procedure cannot contain arguments.​

Question 74

​The ____________________ property is used to specify the sequence of objects on a Windows form that will be selected when the Tab key is pressed.

Question 75

When using inheritance,a subclass can use variables within its base class.​

Question 76

The Visual Basic statement "Dim objStudent As Student" will create and instantiate an object.​

Question 77

The ____________________ property identifies if all digits have been entered into the mask.​

Question 78

Data cannot be passed into an object when it is being instantiated.​

Question 79

A procedure in one class cannot call a procedure in another class within the program.​

Question 80

An outside class cannot call an overridable procedure in the subclass.​