Question 1

Packaging data attributes and behaviors into a single unit so that implementation details can be hidden describes ____ as it relates to object oriented development.
A) abstraction
B) encapsulation
C) polymorphism
D) inheritance

Accepted Answer

Encapsulation is the concept of binding together data attributes and their related behavior (methods) into a single unit, such as a class in object-oriented programming. This allows implementation details to be hidden and users of the class to interact with it through a stable interface, without needing to understand the internal workings or intricacies of the implementation.

Question 2

Replacing a method defined at a higher level creates a(n)____.
A) overloaded method
B) overridden method
C) virtual method
D) abstract method

Accepted Answer

When a method defined at a lower level replaces a method already defined at a higher level, it is called an overridden method. This is often done in inheritance, where a subclass can provide its own implementation of a method already defined in its superclass. Overloading a method means providing multiple methods with the same name but different parameters, and this is not relevant to the scenario described in the question. Virtual and abstract methods are also concepts in object-oriented programming, but they are not directly related to the scenario described.

Question 3

Constructors are defined with ____ access modifiers.
A) private
B) public
C) protected
D) internal

Accepted Answer

Constructors must be accessible to create an object of the class. Therefore, they are defined as public so that they can be accessed from anywhere in the program.

Question 4

Enabling reuse of code through extending the functionality of classes describes ____ as it relates to object oriented development.
A) abstraction
B) encapsulation
C) polymorphism
D) inheritance

Accepted Answer

Enabling reuse of code through extending the functionality of classes is the definition of inheritance in object-oriented development. It allows a subclass to inherit properties and methods from its superclass, promoting code reuse and reducing redundancy.

Question 5

You have experienced the use of polymorphism in programs through the use of the Main( )method.

Accepted Answer

The use of polymorphism in programs is not limited to the Main() method. Polymorphism can be applied to classes, methods, and interfaces in object-oriented programming.

Question 6

Object-oriented development focuses on designing classes that can be reused.One way to ensure this reuse is through designing and building components that can be stored in a library and called on when needed.

Accepted Answer

Object-oriented development does focus on designing reusable classes and one way to ensure reuse is through building components that can be stored and accessed from a library.

Question 7

The ____ keyword can be used to spread the definition of your classes over multiple files.
A) base
B) partial
C) class
D) interface

Accepted Answer

The partial keyword allows us to split the definition of a class over multiple source files. This can be useful for keeping related parts of the code separate to make it more manageable.

Question 8

Enabling multiple implementations of the same behaviors so that the appropriate implementation can be executed based on the situation describes ____ as it relates to object oriented development.
A) abstraction
B) encapsulation
C) polymorphism
D) inheritance

Accepted Answer

Polymorphism refers to the ability of objects of different classes (but with the same superclass) to be treated as objects of that superclass, and to execute different methods depending on their specific implementation. This allows for flexibility and adaptability in software design, as the appropriate implementation can be chosen based on the specific situation or context.

Question 9

When a class implements an interface,the body of each of the interface's methods has to be written in the new class.

Accepted Answer

When a class implements an interface, it has to provide implementation for all the methods present in the interface. Therefore, the body of each of the interface's methods has to be written in the new class.

Question 10

Software components often take the form of classes or collections of methods.

Accepted Answer

The answer of Software components often take the form of...

Question 11

By defining data members as private,you protect the data and enable access only through the object's methods and properties.This describes the ____ feature.
A) abstraction
B) encapsulation
C) polymorphism
D) inheritance

Accepted Answer

The feature being described is encapsulation, which is the process of hiding the implementation details of an object and accessing it only through the defined interface. Defining data members as private is one way of achieving encapsulation in object-oriented programming. Abstraction is a related concept that focuses on defining the essential characteristics of an object while ignoring irrelevant details. Polymorphism refers to the ability of objects to take on multiple forms, while inheritance involves creating new classes based on existing ones.

Question 12

In addition to creating the console and Windows applications you've already created,you can create class library files with a dynamic link library (.EXE)extension that can be reused.

Accepted Answer

Class library files are created with a dynamic link library (.DLL) extension, not an .EXE extension. .EXE files are executable files, while .DLL files contain code that can be reused by different programs.

Question 13

All .NET languages support multiple inheritance.

Accepted Answer

Multiple inheritance is not supported in .NET languages. However, a form of multiple inheritance called "interface inheritance" is supported where a class can implement multiple interfaces.

Question 14

Multiple classes can implement the same interface,but a class can implement only one interface.

Accepted Answer

A class can implement multiple interfaces, allowing for more flexible design and code reuse.

Question 15

The Unified Modeling Language (UML)notation for the interfaces specifies that the name of the Interface methods should appear in italics.

Accepted Answer

The UML notation specifies that the name of the Interface methods should appear in italics.

Question 16

Class library files end with a(n)____ extension.
A)class
B)dll
C)exe
D)cs

Accepted Answer

Class library files typically end with the .dll (dynamic link library) extension.

Question 17

Classes can have a "has a" relationship.This is a concept called ____ or aggregation.
A) "is a"
B) inheritance
C) polymorphism
D) containment

Accepted Answer

Aggregation, also known as containment, represents a "has a" relationship between classes where an object of one class contains objects of another class as its member variables. This is different from inheritance, which represents an "is a" relationship between classes where a subclass inherits properties and behaviors from a superclass. Polymorphism refers to the ability of objects of different classes to be used interchangeably.

Question 18

Abstraction provides a way to simplify complex problems by generalizing and then representing only essential features appropriate to the problem.

Accepted Answer

Abstraction is the process of focusing on essential features and ignoring unnecessary details. It helps in simplifying complex problems by representing only the necessary features.

Question 19

Through defining the methods of a class as private,you protect the class.

Accepted Answer

The answer of Through defining the methods of a class...

Question 20

Components are implemented in C# through ____.
A) classes
B) encapsulation
C) namespaces
D) packages

Accepted Answer

Components are implemented in C# through classes, which define the data and behavior of an object. Encapsulation, namespaces, and packages are all important concepts in C# programming, but they are not directly related to implementing components.

Quiz 11: Advanced Object-Oriented Programming Features

Packaging data attributes and behaviors into a single unit so that implementation details can be hidden describes ____ as it relates to object oriented development.

Replacing a method defined at a higher level creates a(n) ____.

Constructors are defined with ____ access modifiers.

Enabling reuse of code through extending the functionality of classes describes ____ as it relates to object oriented development.

You have experienced the use of polymorphism in programs through the use of the Main( )method.

Object-oriented development focuses on designing classes that can be reused.One way to ensure this reuse is through designing and building components that can be stored in a library and called on when needed.

The ____ keyword can be used to spread the definition of your classes over multiple files.

Enabling multiple implementations of the same behaviors so that the appropriate implementation can be executed based on the situation describes ____ as it relates to object oriented development.

When a class implements an interface,the body of each of the interface's methods has to be written in the new class.

Software components often take the form of classes or collections of methods.

By defining data members as private,you protect the data and enable access only through the object's methods and properties.This describes the ____ feature.

In addition to creating the console and Windows applications you've already created,you can create class library files with a dynamic link library (.EXE)extension that can be reused.

All .NET languages support multiple inheritance.

Multiple classes can implement the same interface,but a class can implement only one interface.

The Unified Modeling Language (UML)notation for the interfaces specifies that the name of the Interface methods should appear in italics.

Class library files end with a(n) ____ extension.

Classes can have a "has a" relationship.This is a concept called ____ or aggregation.

Abstraction provides a way to simplify complex problems by generalizing and then representing only essential features appropriate to the problem.

Through defining the methods of a class as private,you protect the class.

Components are implemented in C# through ____.