Deck 11: Advanced Object-Oriented Programming Features

Question 1

An overloaded method must have exactly the same signature as the method it is overriding.

Answer 1

False

Question 2

Partial classes enable a class to be split into two or more files and combined when the application is compiled and ran.

Answer 2

True

Question 3

When you have a method that has the same name in both the base and derived classes, use the keyword super to refer to the method in the base class.

Answer 3

False

Question 4

Encapsulation enables multiple implementations of the same behaviors so that the appropriate implementation can be executed based on the situation.

Question 5

Adding an abstract modifier to a class prohibits other classes from deriving from that class.

Question 6

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

Question 7

The reserved word base, placed in the constructor heading before the opening curly brace, is used to indicate the base class constructor should be called.

Question 8

When you override a method, the signatures of the methods must match.

Question 9

Once a DLL is available, any application can add a reference to the DLL. The referenced file with the .dll extension becomes part of the application's private assembly.

Question 10

Protected access enables derived classes to have access to change data in the base class.

Question 11

It is not necessary to add a reference to a .dll file if the file is stored in the same project subdirectory.

Question 12

Class library components should be compiled using a Build option instead of Running the application.

Question 13

Components that can be referenced from any number of applications are created as class library files with a dynamic link library (DLL) extension.

Question 14

Generics enable you to identify where data will change in the code segment by putting a placeholder in the code for the type parameters.

Question 15

You cannot spread the definition of your classes over multiple files using the partial keyword. Partial classes are reserved for use by the IDE.

Question 16

Constructors, which use the same identifier as their class, are normally defined with protected access.

Question 17

For classes of animal and dog, animal would be considered the derived class.

Question 18

Access to members that have been defined with the public access modifier is restricted to members of the current class.

Question 19

Today applications are normally designed to be single, self-contained, monolithic programs.

Question 20

All .NET languages support multiple inheritance.

Question 21

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

A) "is a"
B) inheritance
C) polymorphism
D) containment

Question 22

Components are implemented in C# through ____.

A) classes
B) encapsulation
C) namespaces
D) packages

Question 23

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

Question 24

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

Question 25

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

Question 26

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.

Question 27

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

A) base
B) partial
C) class
D) interface

Question 28

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

Question 29

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

Question 30

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

Question 31

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.

Question 32

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

Question 33

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

Question 34

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

Question 35

Which access modifier should be used to give derived classes direct access to change the parent member data. This access modifier does not allow classes that instantiate objects of the class to have access to change member data?

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

Question 36

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

Question 37

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

A) .class
B) .dll
C) .exe
D) .cs

Question 38

Constructors are defined with ____ access modifiers.

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

Question 39

To override a method, the base method may include any of the following keywords, EXCEPT ____.

A) virtual
B) abstract
C) interface
D) override

Question 40

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

A) overloaded method
B) overridden method
C) virtual method
D) abstract method

Question 41

public​ class A : B, C
Which of the following statements is TRUE regarding the above declaration?

A) ​A is the base class.
B) ​B is the derived class.
C) ​C is an interface.
D) ​All of the above are correct.

Question 42

To add dynamic link library components, add a reference to the components in your program and include a using directive. The reason for adding the using directive is to ____.

A) enable the program to use class members
B) avoid fully qualifying references to class members
C) eliminate the syntax errors
D) enable an executable to be created

Question 43

A generic class is defined ____ on the class definition line.

A) by inserting an identifier between left and right parentheses
B) by inserting the word generic
C) by removing the type
D) by inserting an identifier between left and right brackets

Question 44

Which keyword instructs the compiler to infer the type of the variable from the expression on the right side of the initialization statement?

A) dynamic
B) type
C) infer
D) var

Question 45

Use the ____ keyword to mark a class so that it can be used only as the base class from which other classes can be derived.

A) base
B) interface
C) virtual
D) abstract

Question 46

If you do not want subclasses to be able to provide new implementation details, you can add the keyword ____ to methods. Doing so keeps derived classes from being able to override the method.

A) partial
B) abstract
C) virtual
D) sealed

Question 47

Determining which method to call at runtime based on which object invokes the method describes ____.

A) abstraction
B) virtual method calls
C) dynamic binding
D) encapsulation

Question 48

____ classes cannot be instantiated. ____ classes cannot be inherited.

A) Abstract, Sealed
B) Sealed. Abstract
C) Abstract, Abstract
D) Sealed, Sealed

Question 49

In order to inherit from a user-defined base class, you must ____.

A) store both files in the same directory
B) add the base class following a colon
C) add a reference to the base class
D) store both files using the same extension

Question 50

Variables declared as dynamic ____.

A) require boxing or casting to identify the actual data type
B) can hold any type of value
C) stores data as strings
D) must have an associated data type added as part of the declaration

Question 51

Calls to the ToString( ) method emphasize the use of ____.

A) encapsulation
B) inheritance
C) abstraction
D) polymorphism

Question 52

Multiple inheritance is not possible in C#; ____ provides the closest work around to this because a class can implement multiple ____.

A) interfaces
B) abstract classes
C) virtual classes
D) components

Question 53

public static void ExchangeContents (ref T value1, ref T value2) {
T temp;
Temp = value1;
Value1 = value2;
Value2 = temp;
}
​Which of the following is TRUE regarding the above segment of code?

A) ​The segment of code is defining a generic method.
B) ​T is a placeholder for the data type.
C) ​Data in the memory locations value1 and value2 are swapped.
D) ​All of the above

Question 54

____ contain no implementation details for any of their methods.  Instead all their members are considered abstract.

A) Abstract classes
B) Interfaces
C) Virtual classes
D) Base classes

Question 55

When you add the virtual keyword to a method heading, it ____.

A) overrides a method from a base class.
B) tags the method as capable of being overridden.
C) converts the class to an abstract class.
D) forces all classes derived from that class to include implementation details for the method.

Question 56

The distinguishing characteristic of an abstract method is ____.

A) no implementation details are included
B) they cannot be included in abstract classes
C) no parameters are found in the heading for the method
D) methods may not include a return type

Question 57

One way to write reusable code is to use the object data type for instance data members. Doing so then requires ____.

A) moving the data type into a predefined type
B) using a stack to store the items
C) casting and unboxing the data type
D) creating generic classes

Question 58

The base default constructor is called by ____.

A) adding base( ):  between the constructor heading and the opening curly brace
B) typing base( ): as the first executable statement in the derived constructor
C) adding className( ):  between the constructor heading and the opening curly brace
D) typing base( ): as the first executable statement in the Main( ) method

Question 59

​Prior to the introduction of generics, one way to write reusable code was to use the ____  data type for instance data members.

A) ​interface
B) ​object
C) ​var
D) ​string

Question 60

Abstract classes can include ____.

A) regular data field and method members
B) only virtual methods
C) only abstract methods
D) properties and virtual methods

Question 61

Instead of running or executing a dynamic link library file (DLL), you use the ____________ option to create the .DLL component.

Question 62

A stack represents a simple ____________ collection.

Question 63

Polymorphic programming is associated with the ____________. You do not have to know how the method goes about doing its work. All you have to know is what arguments to send, if any, and what you expect to be accomplished when the object finishes its work.

Question 64

To keep subclasses from overriding a method, add the keyword ____________ to the method's heading.

Question 65

Classes that inherit from a base class are called ____________ classes.

Question 66

If a class implements more than one ____________, they all appear on the class definition line separated by commas.

Question 67

____________ is an object oriented feature that packages data attributes and behaviors into a single unit, thus hiding implementation details.

Question 68

____________ allows you to create a general class and then define specialized classes that have access to the members of the general class.

Question 69

A(n) ____________ method uses the same identifier as other method, but has a different number and/or type of parameter from the other one.

Question 70

You can think of an interface as a class that is totally ____________.

Question 71

With C#, you have single inheritance, but a class can ____________ multiple interfaces.

Question 72

Through ____________ the CLR determines which method to call at run time based on which object calls the method.

Question 73

One of the major advantages of strongly typed languages versus dynamic languages is extensive compile type error checking occurs so that bugs can be found early. With dynamic typing this is delayed until ____________.

Question 74

____________ enables algorithms to be written where a number of details, including the data
type can be specified-later.

Question 75

Both var and ____________ enables developers to not associate a specific data type to the actual data when the memory declaration for the variable is written.