Deck 9: Classes and Multiform Projects

Question 1

The ____________ is a method that returns the property's value.

A) Me method
B) get accessor
C) Show method
D) this.Value method

Answer 1

B

Question 2

Classes are ____________ types.

A) reference
B) value
C) abstract
D) binary

Answer 2

A

Question 3

When a field's value is dependent on other data and the field is not updated when its related data changes, we say the field has become ____________.

A) archaic
B) stale
C) obsolete
D) frozen

Answer 3

B

Question 4

Which one of the following statements calls the Jump method of the Animal class using a reference variable named fox?

A) Animal.fox.Jump();
B) Animal(fox) = Jump();
C) fox.Jump();
D) fox = new Jump();

Question 5

The first line of a class declaration is known as the ____________.

A) object heading
B) class header
C) data title
D) class definition

Question 6

Each object created from a class is called a(n) ____________ of the class.

A) object
B) reference
C) instance
D) field

Question 7

A ____________ can be read, but it cannot be modified.

A) private field
B) public field
C) read-only property
D) hidden property

Question 8

Which one of the following statements declares a variable named fox that references an instance of the Animal class?

A) new Animal fox();
B) Animal fox = new Animal();
C) Animal fox;
D) Animal new(fox);

Question 9

When adding a new class file to a Visual C# project, be sure that the filename ends with the ____________ extension.

A) .cls
B) .resx
C) .src
D) .cs

Question 10

In a property definition, the ____________ is automatically created by the compiler, and its data type is the same as that of the property.

A) this variable
B) data parameter
C) copy variable
D) value parameter

Question 11

By using the ____________ access modifier, a class can hide its data from code outside the class.

A) public
B) private
C) const
D) ref

Question 12

When you call a method and pass a class instance as an argument, the parameter variable becomes a(n) ____________ to the object.

A) copy
B) reference
C) address
D) indicator

Question 13

When you pass a property as an argument to a method, there is one restriction: Properties can only be passed ____________.

A) by reference
B) globally
C) by value
D) locally

Question 14

A special set of methods, known as ____________ work in conjunction with a private field.

A) valuators
B) accessors
C) getters and setters
D) transport methods

Question 15

A ____________ is a special type of class member that allows an object to store and retrieve a piece of data.

A) variable
B) field
C) property
D) method

Question 16

A class's ____________ are statements that define the class's fields, properties, and methods.

A) overall body
B) field definitions
C) private elements
D) member declarations

Question 17

When a value is assigned to a property, the property's ____________ is executed, and the value being assigned is contained in the value parameter.

A) set accessor
B) get accessor
C) return statement
D) ToValue method

Question 18

The private field, which is known as the property's ____________, holds any data that is assigned to the property.

A) hidden value
B) shadow variable
C) backing field
D) data core

Question 19

A(n) ____________ is a method that is automatically executed when an object is created.

A) actuator
B) loader
C) constructor
D) executable

Question 20

You create a class by writing a(n) ____________.

A) class declaration
B) object specification
C) preprocessor directive
D) code blueprint

Question 21

When a method is ____________, it means that multiple methods in the same class have the same name but use different types of parameters.

A) parameterized
B) shadowed
C) aliased
D) overloaded

Question 22

If you write a class with no constructor whatsoever, the compiler provides a(n) ____________.

A) error message
B) default constructor
C) null reference variable
D) void constructor

Question 23

A(n) ____________ is a class constructor that accepts no arguments.

A) base constructor
B) parameterless constructor
C) overloaded constructor
D) standard constructor

Question 24

Each of the ____________ in the description of a problem domain is a potential class.

A) verbs
B) articles
C) adjectives
D) nouns

Question 25

When you create an array of a class type, each element of the array will be initialized with the value ____________ by default.

A) 0
B) null
C) false
D) void

Question 26

The process of matching a method call with the correct version of a method is known as ____________.

A) pairing
B) signing
C) binding
D) matching

Question 27

When you create an array of a class type, each element of the array is a ____________ variable.

A) reference
B) global
C) numeric
D) Boolean

Question 28

In Visual Studio, you can easily switch your view to another form by double-clicking the form's entry in the ____________ window.

A) Solution Explorer
B) Code
C) Designer
D) Data Sources

Question 29

When you add additional forms to a project, you add additional ____________, which are stored in their own source code files.

A) classes
B) objects
C) methods
D) events

Question 30

To add a new form to a project, first click ____________ on the Visual Studio menu bar, and then select Add Windows Form... from the Project menu.

A) Project
B) File
C) Tools
D) Window

Question 31

A constructor that accepts arguments is known as a(n) ____________.

A) parameterized constructor
B) alternate constructor
C) constructor method
D) aliased constructor

Question 32

If you wish to remove a form from a project and delete its file from the disk, first right-click on the form's entry in the Solution Explorer window, and on the pop-up menu, click ____________.

A) Erase
B) Remove
C) Delete
D) Purge

Question 33

To add an object of a class to a List, you use the ____________ method.

A) Class
B) Add
C) Insert
D) New

Question 34

A method's ____________ is not part of the signature.

A) return type
B) name
C) parameter data type
D) argument kind

Question 35

When you have identified the information that a class is responsible for knowing, then you have identified the class's ____________.

A) methods
B) names
C) fields and/or properties
D) objects

Question 36

The ____________ is the set of real-world objects, parties, and major events related to the problem.

A) virtual world
B) critical path
C) problem domain
D) project goal

Question 37

If you were developing an application for a local zoo, which one of the following nouns would not apply to the animal class?

A) lions
B) tigers
C) bears
D) zookeepers

Question 38

The compiler uses a method's ____________ to distinguish it from other methods of the same name.

A) binding
B) return type
C) name
D) signature

Question 39

When working with multiple forms, use the ____________ to change the name of the Form1.cs file to something more meaningful.

A) Standard Toolbar
B) Toolbox
C) Solution Explorer
D) Component Tray

Question 40

When you have identified the actions that a class is responsible for doing, you have identified its ____________.

A) event handlers
B) methods
C) fields and/or properties
D) actions

Question 41

If you wish to remove a form from a project but you do not want to delete its file from the disk, first right-click on the form's entry in the Solution Explorer window, and on the pop-up menu, click ____________.

A) Hide Form Only
B) Remove From Project
C) Archive Form Data
D) Exclude From Project

Question 42

Because classes are reference types, objects that are instances of a class are always passed by reference.

Question 43

A class's constructor must always use the private access modifier.

Question 44

When a class's fields are hidden from outside code, its data is vulnerable to accidental corruption.

Question 45

You should never declare a class in its own source file.

Question 46

When a class contains a method that uses the public access modifier, the method can be called from code outside the class.

Question 47

A class is not an object but a description of an object.

Question 48

Suppose a project has a form named SummaryForm. Which one of the following statements creates an instance of the SummaryForm class and assigns it to a variable?

A) SummaryForm.ShowDialog();
B) SummaryForm = this.Form();
C) mySummaryForm = SummaryForm();
D) mySummaryForm = new SummaryForm();

Question 49

In code that creates an instance of a class, you access the class object's properties in the same way you would access public variables.

Question 50

A class's constructor header must specify a return type of void.

Question 51

When a ____________ is displayed, no other form in the application can receive the focus until the form is closed.

A) static form
B) modal form
C) modeless form
D) primary form

Question 52

If you want to show a form in modeless fashion, call its ____________.

A) this.Modeless method
B) Show method
C) ShowDialog method
D) PopUp method

Question 53

The ____________ displays a form on the screen, and it gives that form the focus.

A) this.Focus method
B) ShowDialog method
C) Activate method
D) NewForm method

Question 54

When you create an object from a class, you use a reference variable to reference that object.

Question 55

The same rules for naming variables apply to naming classes.

Question 56

The class header defines a class's fields, properties, and methods.

Question 57

The name of a class's constructor is the same as the name of the class.

Question 58

A property is a class member that behaves like a public field.

Question 59

A ____________ allows the user to switch focus to another form while it is displayed.

A) modeless form
B) subsidiary form
C) modal form
D) minimized form

Question 60

Writing each class in its own separate file makes your code more organized and helps keep your source code files to a manageable size.

Question 61

The set accessor is executed anytime that a property is read.

Question 62

When designing a class, you should take care that all data is stored in a field, especially any calculated data.

Question 63

When finding the classes in a problem description, sometimes a plural noun will indicate a class and a singular noun will indicate an object.

Question 64

Once the classes have been identified in a problem description, the next task is to identify each class's responsibilities.

Question 65

To make a property read only, omit the get accessor for the property.

Question 66

Objects that are instances of a class cannot be stored in an array.

Question 67

It is perfectly legal to write a class without any constructors.

Question 68

The get accessor has an implicit parameter called value.

Question 69

To make a property read only, omit the set accessor for the property.

Question 70

An error will occur if you to try to assign a value to a read-only property.

Question 71

When you want to create a List object, you follow List with the name of a class inside angled brackets, and it specifies that the List can hold only objects of that class type.

Question 72

All of the nouns that appear in the problem description should become classes.

Question 73

Some programmers begin the names of backing fields with an underscore to eliminate confusion between the field name and the property name.

Question 74

When an accessor contains only a single return statement, many programmers prefer to write the entire accessor in one line of code.

Question 75

If you try to pass a property to a ref or an out parameter, an error occurs.

Question 76

Constructors cannot accept arguments in the same way as other methods.

Question 77

Class fields are almost always declared private in order to protect them from accidental corruption.

Question 78

When designing an object-oriented application, one of your first tasks is to identify the classes that you will need to create.

Question 79

Constructors cannot be overloaded, which means a class can have only one constructor.

Question 80

If two methods have the same names and parameter lists, you cannot overload them by just giving them different return types.