You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
- content: "What does the colon (`:`) character indicate in the declaration of a derived class in C#?"
16
+
choices:
17
+
- content: "It indicates that the derived class is implementing an interface."
18
+
isCorrect: false
19
+
explanation: "Incorrect. The colon (`:`) character in C# is used to indicate inheritance, not interface implementation."
20
+
- content: "It indicates that the derived class is defining a new property or method."
21
+
isCorrect: false
22
+
explanation: "Incorrect. The colon (`:`) character in C# is used to indicate inheritance, not the definition of new properties or methods."
23
+
- content: "It indicates that the derived class is inheriting from a base class."
24
+
isCorrect: true
25
+
explanation: "Correct. In C#, the colon (`:`) character is used in the declaration of a derived class to indicate that it's inheriting from a base class."
26
+
- content: "What is the effect of the `sealed` keyword in C# inheritance?"
27
+
choices:
28
+
- content: "It allows a method to be overridden in derived classes."
29
+
isCorrect: false
30
+
explanation: "Incorrect. The `sealed` keyword prevents a method from being overridden in derived classes."
31
+
- content: "It allows a class to be used as a base class for other classes."
32
+
isCorrect: false
33
+
explanation: "Incorrect. The `sealed` keyword prevents a class from being used as a base class for other classes."
34
+
- content: "It prevents a class or class member from being inherited or overridden."
35
+
isCorrect: true
36
+
explanation: "Correct. The `sealed` keyword in C# is used to prevent a class or class member from being inherited or overridden."
37
+
- content: "What is the purpose of using the `new` keyword when defining members in a derived class?"
38
+
choices:
39
+
- content: "To hide base class members intentionally or to avoid accidental overriding of base class members."
40
+
isCorrect: true
41
+
explanation: "Correct. The `new` keyword allows you to define new members in a derived class that have the same name as members in the base class. The `new` keyword hides the corresponding base class members."
42
+
- content: "To create a new instance of the derived class."
43
+
isCorrect: false
44
+
explanation: "Incorrect. The `new` keyword doesn't create a new instance of the derived class."
45
+
- content: "To override the base class members with the same name."
46
+
isCorrect: false
47
+
explanation: "Incorrect. The `new` keyword doesn't override base class members."
48
+
- content: "What is the purpose of the `override` keyword in C#?"
49
+
choices:
50
+
- content: "It indicates that the member has no implementation and must be overridden in a derived class."
51
+
isCorrect: false
52
+
explanation: "Incorrect. The `override` keyword doesn't indicate that the member has no implementation and must be overridden in a derived class. This definition matches the `abstract` keyword."
53
+
- content: "It indicates that the base class member is extended or modified in the derived class."
54
+
isCorrect: true
55
+
explanation: "Correct. The `override` keyword in C# is used to extend or modify the behavior of the base class. Overriding provides custom implementations for properties and methods inherited from the base class."
56
+
- content: "It indicates that the derived class hides members of the base class with new implementations."
57
+
isCorrect: false
58
+
explanation: "Incorrect. The `override` keyword doesn't hide members of the base class with new implementations in the derived class. This definition matches the `new` keyword."
59
+
- content: "What is the purpose of the `base` keyword in a derived class?"
60
+
choices:
61
+
- content: "To access derived class members from a base class."
62
+
isCorrect: false
63
+
explanation: "Incorrect. The `base` keyword is used in a derived class to access members of the base class, not the other way around."
64
+
- content: "To access base class members from a derived class."
65
+
isCorrect: true
66
+
explanation: "Correct. The `base` keyword is used in a derived class to access members of the base class, including methods, properties, and constructors."
67
+
- content: "To specify which derived-class constructor should be called when creating instances of the base class."
68
+
isCorrect: false
69
+
explanation: "Incorrect. The `base` keyword is used in a derived class to specify which base-class constructor should be called when creating instances of the derived class."
70
+
- content: "What is the primary purpose of implementing base and derived classes in C#?"
71
+
choices:
72
+
- content: "To reduce the amount of code needed for each class."
73
+
isCorrect: false
74
+
explanation: "Incorrect. Although implementing base and derived classes can sometimes reduce the amount of code, reducing the amount of code isn't the primary purpose of implementing base and derived classes."
75
+
- content: "To establish a hierarchy of classes that share common attributes and behaviors."
76
+
isCorrect: true
77
+
explanation: "Correct. Base and derived classes are used to establish a hierarchy of classes that share common attributes and behaviors, promoting reusability and organization."
78
+
- content: "To create multiple instances of the same class."
79
+
isCorrect: false
80
+
explanation: "Incorrect. While it's possible to create multiple instances of a class, creating instances of the same class isn't the primary purpose of implementing base and derived classes."
Class inheritance is a fundamental concept in object-oriented programming. Inheritance enables the creation of class hierarchies, promotes code reuse, and extensibility. This module focuses on understanding and implementing inheritance in C#.
2
+
3
+
Imagine you're working at a non-profit company that's in the midst of a software update project. The application's complexity requires a modular and reusable code structure, and you're concerned about code readability, maintainability, and organization. You need to understand how to implement a class hierarchy that implements inheritance and support polymorphic behavior. This module guides you through these concepts and provides practical examples to help you apply them in your work.
4
+
5
+
The topics covered in this module include:
6
+
7
+
- Examine the principles of class inheritance.
8
+
- Configure base and derived classes.
9
+
- Extend a derived class with new members.
10
+
- Override properties and methods in a derived class.
11
+
- Access base class members from a derived class.
12
+
- Implement base and derived classes in a C# app.
13
+
14
+
After completing this module, you're able to:
15
+
16
+
- Explain the principles of class inheritance.
17
+
- Describe the default characteristics of a derived class.
18
+
- Control the visibility of inherited members using access modifiers and keywords like `abstract`, `virtual`, and `sealed`.
19
+
- Describe the use of `new` and `override` keywords in a derived class.
20
+
- Override properties and methods in a derived class.
21
+
- Access base class members in a derived class.
22
+
- Implement base and derived classes in a C# app.
23
+
24
+
By the end of this module, you have a solid understanding of class inheritance in C# and you're able to implement a class hierarchy using base and derived classes.
0 commit comments