1. AP Computer Science DYRT Quiz 09.01-07 Key
Take out a piece of paper and PEN.
The quiz starts TWO minutes after the tardy bell rings.
You will have 30 seconds per question.

2. Title the quiz as shown below The quiz starts in ONE minute.
Name
Period
Date
Quiz
EC.

3. Question 01 Inheritance describes what type of relationship? “is-a”
“has-a”

4. Question 02 Composition describes what type of relationship? “is-a”
“has-a”

5. Question 03
Which of the following shows an example of an inheritance relationship?
dog cat.
house door
hanger closet
student person 5

6. Question 04
Which of the following shows an example of a composition relationship?
dog cat.
house door
hanger closet
student person 6

7. Question 05 Inheritance involves the use of at least two
classes. The existing (and more general)
class is called the
superclass.
default class.
overloaded class.
subclass.

8. Question 06 Inheritance involves the use of at least two
classes. The new and improved class which
uses inheritance is called the
superclass.
default class.
overloaded class.
subclass.

9. Question 07 Which single Java keyword indicates that
inheritance is used?
isa
hasa
extends
inherits
super

10. Question 08
True or False
When an object of a subclass is instantiated,
the constructor of the superclass is called first.
True
(b) False

11. Question 09 True or False Methods of a subclass have access to
private data of a superclass.
True
(b) False

12. Question 10 True or False Methods of a subclass have access to the
protected data of a superclass.
True
False

13. Question 11 The Geometry analogy which states that
a square is a rectangle is an example of
encapsulation.
concatenation.
inheritance.
polymorphism.

14. Question 12
How should super class data be declared if you want to grant direct access to subclass methods, but you do not want to grant direct access to methods of all classes?
(a) public
(b) private
(c) protected 14

15. Question 13
True of False
Inheritance is limited to two levels with two
classes.
True
(b) False

16. Question 14 Which of these is possible in C++, but not in Java?
(a) multi-level inheritance
(b) multiple inheritance
umbrella classes
composition

17. Question 15 Animal Mammal Dog Terrier Look at this graphic.
What is this an example of?
multi-level inheritance
multiple inheritance
an umbrella class
composition
Question 15
Animal
Mammal
Dog
Terrier

18. Question 16 Look at this graphic. What is this an example of?
multi-level inheritance
multiple inheritance
an umbrella class
composition
Question 16

19. Question 17 Reptile Extinct Dinosaur Look at this graphic.
What is this an example of?
multi-level inheritance
multiple inheritance
an umbrella class
composition
Question 17
Reptile
Extinct
Dinosaur

20. Question 18 Look at this graphic. What is this an example of?
multi-level inheritance
multiple inheritance
an umbrella class
composition
Question 18

21. Question 19 What is the umbrella class in this example?
Animal tiger = new Cat( );
Animal eagle = new Bird( );
Animal shark = new Fish( );
Animal
Bird
Cat
Fish

22. Question 20 Can this program code be correct?
Animal tiger = new Cat( );
Animal eagle = new Bird( );
Animal shark = new Fish( );
No, because the Animal class cannot be used to construct Cat, Bird or Fish objects.
No, because Animal is a subclass.
Yes, because Animal is a superclass.
Yes, because Animal is a subclass.

23. Extra Credit
If the super class constructor requires one or more parameters, what command must be the very first command of the subclass constructor?
(a) isa (d) hasa
(b) extends (e) inherits
(c) sub (f) super