Deck 9: Classes and Multiform Projects

Question 1

When a field's value is tightly dependent on other data and that field is not updated when the other data is changed, it is said that the field has become ____________.

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

Answer 1

B

Question 2

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

Answer 2

C

Question 3

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

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

Answer 3

C

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

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 7

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 8

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 9

When you pass an object that is an instance of a class as an argument, the thing that is passed into the parameter variable is a(n) ____________ to the object.

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

Question 10

Classes are ____________ types.

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

Question 11

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

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

Question 12

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

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

Question 13

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

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

Question 14

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) new Animal(fox);
D) Animal fox(new);

Question 15

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 16

Anytime a value is assigned to a property, the property's ____________ is executed, and the value being assigned is passed into the value parameter.

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

Question 17

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

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

Question 18

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

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

Question 19

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 20

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

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

Question 21

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

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

Question 22

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 23

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

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

Question 24

When you have identified the things 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 25

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

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

Question 26

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

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

Question 27

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 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

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 30

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

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

Question 31

Consider you are 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 32

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 33

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 34

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 35

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 36

When working with multiple forms, you 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 37

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

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

Question 38

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

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

Question 39

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 40

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 41

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

Question 42

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

Question 43

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 44

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

Question 45

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 46

You should never store classes in their own files.

Question 47

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 48

Suppose a project has a form named SummaryForm, which one of the following statements creates an instance of the SummaryForm class?

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

Question 49

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

Question 50

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

Question 51

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

Question 52

The same rules for naming variables apply to naming classes.

Question 53

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 54

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 55

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

Question 56

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

Question 57

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

Question 58

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 59

In code, you work with properties in the same way you work with variables.

Question 60

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

Question 61

You cannot overload methods by giving them different return types.

Question 62

When developing an object-oriented program, on of your first tasks is to identify the classes that you will need to create.

Question 63

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

Question 64

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

Question 65

The get accessor has an implicit parameter called value.

Question 66

It is important to realize that designing an object-oriented application is an iterative process.

Question 67

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

Question 68

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

Question 69

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

Question 70

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

Question 71

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

Question 72

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

Question 73

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

Question 74

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

Question 75

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

Question 76

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

Question 77

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

Question 78

If you need to make a property read only, you simply do not write a get accessor for the property.

Question 79

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 80

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