1. What is an “is-a” relationship? 2. A program uses two classes: Animal and Dog. Which class is the superclass and which is the subclass? 3. What is the superclass and what is the subclass in the...

1. What is an “is-a” relationship?

2. A program uses two classes: Animal and Dog. Which class is the superclass and which is the subclass?

3. What is the superclass and what is the subclass in the following line?

public class Pet extends Dog

4. What is the difference between a protected class member and a private class member?