Question 1

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

Accepted Answer

A class's constructor can use any access modifier (public, protected, private) or no modifier at all. However, using private access modifier for a constructor means that the class can only be instantiated from within the same class.

Question 2

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

Accepted Answer

A property allows controlled access to class fields by providing a get and/or set method, while behaving like a public field to those accessing it from outside the class.

Question 3

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

Accepted Answer

The Show method displays the form in a modeless fashion, meaning that the user can still interact with other forms and windows while the form is displayed. The ShowDialog method, on the other hand, displays the form modally, meaning that the user cannot interact with any other form or window until the form is closed. The other options (A and D) are not valid methods for displaying a form.

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

The ShowDialog method displays a form as a modal dialog box and gives it the focus, which means that the user cannot interact with other windows until the dialog box is closed.

Question 6

You should never store classes in their own files.

Accepted Answer

It is common practice to store each class in its own file in order to improve organization and readability of code.

Question 7

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

Accepted Answer

The option to "Exclude From Project" removes the form from the project without deleting its file from the disk. This allows the form to be easily added back to the project later if needed without needing to recreate it.

Question 8

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();

Accepted Answer

The correct statement to create an instance of the SummaryForm class is to use the "new" keyword followed by the class name and parentheses. Therefore, the correct statement is "SummaryForm mySummaryForm = new SummaryForm();" which will create a new instance of the SummaryForm class and assign it to the variable mySummaryForm.

Question 9

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

Accepted Answer

When a class's fields are hidden from outside code, it is a form of encapsulation that protects the data from accidental corruption by restricting direct access and allowing controlled access through methods.

Question 10

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

Accepted Answer

In Java, the constructor of a class has the same name as the class itself.

Question 11

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

Accepted Answer

The constructor does not have a return type, not even void. Its purpose is to initialize the object.

Question 12

The same rules for naming variables apply to naming classes.

Accepted Answer

The same rules for naming variables also apply to naming classes, such as starting with a letter or underscore, using only letters, numbers, and underscores, and avoiding reserved keywords. However, there are also naming conventions specific to classes, such as using CamelCase and starting with an uppercase letter.

Question 13

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

Accepted Answer

Writing each class in its own separate file simplifies the organization of your code and helps keep your source code files at a manageable size.

Question 14

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

Accepted Answer

A modal form is one that stops the user from interacting with any other open form in the application until it is closed. This is commonly used for important or critical actions that require the user's attention and focus. A static form, on the other hand, allows the user to interact with other forms while it remains open. Modeless forms are similar to static forms in that they allow the user to interact with other forms while they are open, but they typically remain on top of other forms and require the user to actively dismiss them. A primary form is not a commonly used term in relation to form focus.

Question 15

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

Accepted Answer

The class header only defines the class name and any inheritance or interface implementation. Fields, properties, and methods are defined within the class body.

Question 16

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

Accepted Answer

Objects that are instances of a class are always passed by reference because classes are reference types in most programming languages.

Question 17

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

Accepted Answer

A class is a blueprint or template for creating objects, and is not an object itself. It defines the properties and methods that an object of that class will have.

Question 18

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

Accepted Answer

A modeless form allows the user to switch focus to another form while it is displayed. Modal forms, on the other hand, require the user to take some action before they can switch to another form. Subsidiary and minimized forms are not relevant to this question.

Question 19

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

Accepted Answer

Properties can be accessed and modified in much the same way as variables, by using them in expressions and assignments.

Question 20

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

Accepted Answer

When a method has a public access modifier, it can be accessed and called from code outside the class.

Quiz 9: Classes and Multiform Projects