Deck 4: Creating Your Own Classes

Question 1

A private access modifier is always associated with data members, methods, and constructors of a class.

Answer 1

False

Question 2

A property looks like a method because it directly represents a storage location.

Answer 2

False

Question 3

Mutators are special types of methods used to create objects.

Answer 3

False

Question 4

When you define a class method, you define its characteristics or fields in terms of the data.

Question 5

A class is an instance of an object.

Question 6

When you define a class and determine what data members it should have, you are declaring instance variables or fields that will represent the state of an object.

Question 7

Three of the contextual keywords associated with properties are get, set, and value.

Question 8

An object is like a class template. The object is used to define the structure for the different classes that are going to be of that type.

Question 9

If you overwrite the ToString( ) method, you should also override the other methods of the object class.

Question 10

A constructor is used to instantiate a class from an object.

Question 11

The keyword new is used as an operator to call constructor methods.

Question 12

A standard convention used by C# programmers is to use camel case style for property identifiers; Camel case style convention is also used for data member identifiers.

Question 13

A standard naming convention in C# for properties is to use the same name as the instance variable or field, except begin the identifier using an uppercase character.

Question 14

When you define a property, you can define the set without the get, but you must define a get.

Question 15

When you define methods of a class, you are defining its behaviors, in terms of what kinds of things it can do.

Question 16

The return type for constructors is always the type of the class.

Question 17

The ToString( ) method of the Console class should be overwritten.

Question 18

ToString( ), Equals( ), GetType( ), and GetHashCode( ) are all methods of the object class.

Question 19

A class named River will have a constructor named River.

Question 20

With the object-oriented approach, objects send messages to other objects and receive messages from objects.

Question 21

When you create an application that has two files, both must have a Main( ) method.

Question 22

Constructors differ from other methods in that constructors ____.

A) are not defined by the programmer
B) always return  a value
C) are defined outside of the class
D) use the same identifier as the class

Question 23

Local variables ____.

A) are defined inside Main( ) and other methods
B) must be defined as private
C) are defined in classes
D) determine the data characteristics for the class

Question 24

Accessors are also referred to as ____.

A) mutators
B) properties
C) getters
D) classes

Question 25

To add full functionality to your classes, ____.

A) write more than one constructor
B) write a default constructor
C) write at least five constructors for each class
D) omit writing a constructor so that the default one will be created for you

Question 26

Since the data members of the class are defined as private, their public property counterpart must be used to assign new values to the data members.

Question 27

When you define the class, you describe its ____ in terms of data and its behaviors, or methods, in terms of what kinds of things it can do.

A) attributes
B) fields
C) characteristics
D) all of the above

Question 28

Use a type prefix, such as C for class name. For example, a student class should be named CStudent.

Question 29

A property resembles a(n) ____, but is more closely aligned to a(n) ____.

A) data field, method
B) method, data field
C) object, mutator
D) mutator, accessor

Question 30

A class is normally associated with a(n) ____, which often describes a person, place, or thing and is normally a noun.

A) method member
B) behavior
C) data member
D) entity

Question 31

The default constructor normally has an empty body.

Question 32

All data types are initialized to 0 when an object is constructed.

Question 33

Instance methods must have the static keyword in their heading.

Question 34

C# is an object-oriented language. All the code for an application must be placed in a(n) ____.

A) file
B) object
C) class
D) method

Question 35

Accessors are special types of methods in C# used to instantiate an object of the class.

Question 36

Design your classes to be as flexible and full-featured as possible. One way to do this is to include multiple instance data members.

Question 37

The ToString( ) method is automatically invoked when the Write( ) or WriteLine( ) methods are called.

Question 38

Constructors should be defined with a ____ access modifier.

A) public
B) private
C) protected
D) static

Question 39

To program an object-oriented solution begin by determining what ____ are needed in the solution.

A) data
B) objects
C) processes
D) methods

Question 40

Constructors are methods.

Question 41

The ToString( ) method is automatically invoked when an object reference is made in the ____.

A) class constructor
B) Write( ) method
C) mutator method
D) object class

Question 42

Instance methods are ____.

A) nonstatic methods.
B) also called class methods.
C) defined in the Main( ) method.
D) defined outside of the class.

Question 43

Variables declared in the Main( ) method are ____.

A) visible inside any method in the class.
B) are automatically initialized to zero.
C) must be defined as private data members.
D) only visible inside Main( ).

Question 44

The static keyword must not be used with ____.

A) data members
B) instance methods
C) class methods
D) all of the above

Question 45

Instance methods manipulate data by ____.

A) directly accessing private data members.
B) passing information as arguments through parameters.
C) using constructors and accessors.
D) sending visible data in the Main( ) method.

Question 46

____ are special methods used to read the current state or value of an object member's data.

A) Accessors
B) Mutators
C) Constructors
D) Setters

Question 47

To define a property to change a data member of a class include a ____ clause.

A) mutator
B) get
C) set
D) value

Question 48

In order to provide a new definition for the ToString( ) method, ____.

A) it must be defined using the new operator.
B) there must be at least one constructor defined.
C) use the keyword override in the heading
D) both mutators and accessors must have been defined.

Question 49

Which of the following is NOT one of the inherited member methods of the object class?

A) ToString( )
B) Equals( )
C) GetType( )
D) Main( )

Question 50

plush.PricePerSqYard = 40.99;
If proper naming conventions were used in the above statement, which of the following statements is true?

A) PricePerSqYard is a property
B) plush is an object
C) 40.99 is a numeric literal
D) all of the above

Question 51

Class methods manipulate data by ____.

A) directly accessing private data members.
B) passing information as arguments through parameters.
C) using constructors and accessors.
D) sending visible data in the Main( ) method.

Question 52

Constructors ____.

A) can be overloaded.
B) do not have to be written.
C) do not return a value.
D) all of the above.

Question 53

Normally data members are defined to have ____ access.

A) public
B) private
C) protected
D) internal

Question 54

Which of the following is true regarding methods of a class?

A) You must use the keyword static.
B) They are called instance methods.
C) To call methods of the class in the class, you must prefix the method name with the class name.
D) No return type is used when you define a class method.

Question 55

In order to test a class, ____.

A) a different class is needed.
B) invoke instance methods using the objects you construct.
C) use the properties to assign and retrieve values.
D) all of the above.

Question 56

When you define a class, you can use ____ to display all public members of the class (once an object is instantiated).

A) constructors
B) intellisense
C) instance methods
D) class diagrams

Question 57

To design a class that is flexible and full-featured, ____.

A) define a constructor for every possible combination of data members.
B) define a default constructor.
C) define at least three constructors.
D) include multiple constructors.

Question 58

Accessors, mutators, and other instance methods are normally defined with what type of access modifier?

A) private
B) protected
C) internal
D) public

Question 59

Which of the following is NOT a true statement relating to constructors?

A) To add full functionality to your classes, write multiple constructors
B) If you write one constructor, you lose the default one that is created automatically.
C) The default constructor must be the first one written for the class.
D) Constructors are used to provide values to the object's data members.

Question 60

WriteLine("Value = {0:N0}", 12345.9032);
What will be displayed from the above line?

A) Value = 12,346
B) Value = 12346
C) Value = 12,345
D) Value = 12,346.0

Question 61

After the class diagram is created, add the names of data members or fields and methods
using the_________________ section.

Question 62

The body of the constructor methods consist primarily of ____________.

Question 63

By abstracting out the attributes (data) and the behaviors (processes on the data), you can create a(n) ____________ to serve as a template from which many objects of that type can be instantiated.

Question 64

Fields or data members are also called ____________.

Question 65

If berber is an object, the statement Console.Write(berber); automatically invokes the ____________ method.

Question 66

After a project has been created and a new class added to your application, you can use the ____________ Window in Visual Studio to create a class diagram.

Question 67

As with overloaded methods, ____________ must differ for constructors.

Question 68

____________ access modifier is always associated with constructors.

Question 69

Data members should be defined with an access mode of ____________.

Question 70

Constructors are used to ____________ a class.

Question 71

The ____________ constructor does not have any parameters and normally has no body, just opening and closing curly braces.

Question 72

Accessor and mutators are ____________ methods

Question 73

When you define the class, you describe its ____________, or characteristics or fields, in terms of data.

Question 74

During the design phase, it is important to develop a(n) ____________ illustrating what the desired final output should be.

Question 75

C# is an object-oriented language as such all the code that you write has to be placed in a(n) ____________.