Section 9.5: Interfaces 22. What is the difference between implementing an interface and extending a class?
Section 9.5: Interfaces 22. What is the difference between implementing an interface and extending a class?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
Related questions
Question
Number 22
![18. What is the difference between an is-a and a has-a relationship? How do you create a has-a relationship in your code?
19. Imagine a Rectangle class with objects that represent two-dimensional rectangles. The Rectangle has width and
height fields with appropriate accessors and mutators, as well as getArea and getPerimeter methods.
You would like to add a Square class into your system. Is it a good design to make Square a subclass of
Rectangle? Why or why not?
20. Imagine that you are going to write a program to play card games. Consider a design with a Card class and 52 sub-
classes, one for each of the unique playing cards (for example, NineOf Spades and JackOfClubs). Is this a good
design? If so, why? If not, why not, and what might be a better design?
21. In Section 9.2 we discussed adding functionality for dividend payments to the Stock class. Why was it preferable to
create a DividendStock class rather than editing the Stock class and adding this feature directly to it?
Section 9.5: Interfaces
22. What is the difference between implementing an interface and extending a class?
23. Consider the following interface and class:
}
public interface I {
public void m1();
public void m2();
}
public class C implements I {
// code for class C
What must be true about the code for class C in order for that code to compile successfully?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F17b2b269-c224-4f1b-8543-902ce99e9774%2Fb5696ab8-1287-417b-bcd4-1a36ae43f93f%2F2wxh2yt_processed.jpeg&w=3840&q=75)
Transcribed Image Text:18. What is the difference between an is-a and a has-a relationship? How do you create a has-a relationship in your code?
19. Imagine a Rectangle class with objects that represent two-dimensional rectangles. The Rectangle has width and
height fields with appropriate accessors and mutators, as well as getArea and getPerimeter methods.
You would like to add a Square class into your system. Is it a good design to make Square a subclass of
Rectangle? Why or why not?
20. Imagine that you are going to write a program to play card games. Consider a design with a Card class and 52 sub-
classes, one for each of the unique playing cards (for example, NineOf Spades and JackOfClubs). Is this a good
design? If so, why? If not, why not, and what might be a better design?
21. In Section 9.2 we discussed adding functionality for dividend payments to the Stock class. Why was it preferable to
create a DividendStock class rather than editing the Stock class and adding this feature directly to it?
Section 9.5: Interfaces
22. What is the difference between implementing an interface and extending a class?
23. Consider the following interface and class:
}
public interface I {
public void m1();
public void m2();
}
public class C implements I {
// code for class C
What must be true about the code for class C in order for that code to compile successfully?
Expert Solution
![](/static/compass_v2/shared-icons/check-mark.png)
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 3 steps
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)
Recommended textbooks for you
![Computer Networking: A Top-Down Approach (7th Edi…](https://www.bartleby.com/isbn_cover_images/9780133594140/9780133594140_smallCoverImage.gif)
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
![Computer Organization and Design MIPS Edition, Fi…](https://www.bartleby.com/isbn_cover_images/9780124077263/9780124077263_smallCoverImage.gif)
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
![Network+ Guide to Networks (MindTap Course List)](https://www.bartleby.com/isbn_cover_images/9781337569330/9781337569330_smallCoverImage.gif)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
![Computer Networking: A Top-Down Approach (7th Edi…](https://www.bartleby.com/isbn_cover_images/9780133594140/9780133594140_smallCoverImage.gif)
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
![Computer Organization and Design MIPS Edition, Fi…](https://www.bartleby.com/isbn_cover_images/9780124077263/9780124077263_smallCoverImage.gif)
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
![Network+ Guide to Networks (MindTap Course List)](https://www.bartleby.com/isbn_cover_images/9781337569330/9781337569330_smallCoverImage.gif)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
![Concepts of Database Management](https://www.bartleby.com/isbn_cover_images/9781337093422/9781337093422_smallCoverImage.gif)
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
![Prelude to Programming](https://www.bartleby.com/isbn_cover_images/9780133750423/9780133750423_smallCoverImage.jpg)
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
![Sc Business Data Communications and Networking, T…](https://www.bartleby.com/isbn_cover_images/9781119368830/9781119368830_smallCoverImage.gif)
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY