Question 1

What is the difference between overriding a method and overloading a method with respect to method signatures?

Accepted Answer

The answer of What is the difference between overriding a...

Question 2

The Sort() method accepts an array as a parameter and arranges its elements in descending order. What complication arises when you sort an array of objects? Explain how to use the IComparable interface to address this problem.

Accepted Answer

The answer of The Sort() method accepts an array as...

Question 3

As an alternative to repeating code in multiple constructors, a ____ indicates that another instance of a class constructor should be executed before any statements in the current constructor body.
A) parameterless constructor
B) value constructor
C) constructor initializer
D) default constructor

Accepted Answer

A constructor initializer, also known as a constructor chaining, allows for the reuse of code by indicating that another constructor should be executed before the current constructor body. This avoids the need to duplicate code in multiple constructors. Therefore, the correct answer is C.

Question 4

When a method ____ another, it takes precedence over the method, hiding the original version.
A) instantiates
B) overrides
C) overloads
D) extends

Accepted Answer

When a method overrides another, it replaces the original implementation with its own implementation. This allows for more specific or specialized behavior to be implemented in the overriding method.

Question 5

Briefly explain how to create instance variables, and show how to define a private integer instance variable called idNumber within a class called Employee .

Accepted Answer

The answer of Briefly explain how to create instance variables,...

Question 6

Classes that support simple data items each contain a method named ____, which provides the details of how items in the class compare to each other.
A) Equals()
B) Less()
C) IndexOf()
D) CompareTo()

Accepted Answer

The method that provides the details of how items in the class compare to each other is the CompareTo() method. This method is used in cases where we need to sort or order objects in the class or compare two objects of the same class. It returns an integer value that indicates whether the current instance is less than, equal to, or greater than the specified object.

Question 7

What are the three parts of a class definition in C#?

Accepted Answer

The answer of What are the three parts of a...

Question 8

Like any other C# method, constructors can be overloaded. Show how to create two public constructors-one with no parameters, and one with a parameter called sal -that both set the value for the property Salary within the following class: 
class Employee 
{ 
public double Salary; 
}

Accepted Answer

The answer of Like any other C# method, constructors can...

Question 9

What are the class access modifiers in C#?

Accepted Answer

The answer of What are the class access modifiers in...

Question 10

A(n) ____ is a collection of abstract methods (and perhaps other members) that can be used by any class, as long as the class overrides the abstract method definitions.
A) multifile assembly
B) framework
C) interface
D) destructor

Accepted Answer

An interface is a collection of abstract methods (and perhaps other members) that can be used by any class, as long as the class overrides the abstract method definitions. It defines a contract that implementing classes must follow. A multifile assembly is a .NET assembly that contains multiple modules or files. A framework is a reusable set of libraries or classes that provides a consistent way of developing applications. A destructor is a special method that is called when an object is being destroyed or garbage collected.

Question 11

Methods associated with objects are called ____________________.

Accepted Answer

The answer of Methods associated with objects are called ____________________....

Question 12

A ____ contains the actions you require when an instance of a class is destroyed-for example, when the instance goes out of scope.
A) constructor
B) constructor initializer
C) destructor
D) parameterless constructor

Accepted Answer

A destructor is a special method that will be invoked automatically to release the resources obtained by an object during its lifetime. It deallocates the memory allocated by the object and cleans up any resources such as file handles or database connections, which were acquired by the object during its lifetime. A constructor initializes an object and is called when an object of a class is created. A constructor initializer is a technique used to provide initial values to the data members of a class. A parameterless constructor is a constructor that doesn't accept any parameters.

Question 13

Briefly describe what an object initializer does and give a specific example. When is the object initializer assignment made?

Accepted Answer

The answer of Briefly describe what an object initializer does...

Question 14

A(n) ____________________ is a member of a class that provides access to a field of a class.

Accepted Answer

The answer of A(n) ____________________ is a member of a...

Question 15

Properties contain ____________________ for setting an object's fields.

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The answer of Properties contain ____________________ for setting an object's...

Question 16

Creating an object requires two steps that are shown in the example below: 
Employee myAssistant; 
myAssistant = new Employee(); 
What do these statements accomplish?

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The answer of Creating an object requires two steps that...

Question 17

C# contains a(n) ____ interface, which contains the definition for the CompareTo() method that compares one object to another and returns an integer.
A) IComparable
B) Comparable
C) ICompareTo
D) CompareTo

Accepted Answer

C# contains the IComparable interface, which defines the CompareTo() method that compares one object to another and returns an integer. This interface is implemented by classes that want to support sorting and ordering based on their properties.

Question 18

An object is a(n) ____________________ (tangible example) of a class.

Accepted Answer

The answer of An object is a(n) ____________________ (tangible example)...

Question 19

Write an example method that overrides the + operator to create a new book whose title is a concatenation of the titles of two books. For example, if the first book's title is "The Adventures of Tom Sawyer" and the second book's title is "The Adventures of Huckleberry Finn", the concatenated title will be "The Adventures of Tom Sawyer and The Adventures of Huckleberry Finn".  Assume the book class is defined as: 
class Book 
{ 
public Book( string title) 
{ 
Title = title; 
} 
public string Title {get; set;} 
}

Accepted Answer

The answer of Write an example method that overrides the...

Question 20

A(n) ____________________ is a method that instantiates (creates an instance of) an object.

Accepted Answer

The answer of A(n) ____________________ is a method that instantiates...

Quiz 9: Using Classes and Objects

What is the difference between overriding a method and overloading a method with respect to method signatures?

The Sort() method accepts an array as a parameter and arranges its elements in descending order. What complication arises when you sort an array of objects? Explain how to use the IComparable interface to address this problem.

As an alternative to repeating code in multiple constructors, a ____ indicates that another instance of a class constructor should be executed before any statements in the current constructor body.

When a method ____ another, it takes precedence over the method, hiding the original version.

Briefly explain how to create instance variables, and show how to define a private integer instance variable called idNumber within a class called Employee .

Classes that support simple data items each contain a method named ____, which provides the details of how items in the class compare to each other.

What are the three parts of a class definition in C#?

Like any other C# method, constructors can be overloaded. Show how to create two public constructors-one with no parameters, and one with a parameter called sal -that both set the value for the property Salary within the following class: class Employee { public double Salary; }

What are the class access modifiers in C#?

A(n) ____ is a collection of abstract methods (and perhaps other members) that can be used by any class, as long as the class overrides the abstract method definitions.

Methods associated with objects are called ____________________.

A ____ contains the actions you require when an instance of a class is destroyed-for example, when the instance goes out of scope.

Briefly describe what an object initializer does and give a specific example. When is the object initializer assignment made?

A(n) ____________________ is a member of a class that provides access to a field of a class.

Properties contain ____________________ for setting an object's fields.

Creating an object requires two steps that are shown in the example below: Employee myAssistant; myAssistant = new Employee(); What do these statements accomplish?

C# contains a(n) ____ interface, which contains the definition for the CompareTo() method that compares one object to another and returns an integer.

An object is a(n) ____________________ (tangible example) of a class.

A(n) ____________________ is a method that instantiates (creates an instance of) an object.