AP CSA - Inheritance, plus one while loop.

Consider classes Manager and Employee. Which should be the superclass and which should be the subclass?

• Manager is the superclass.

  Employee is the subclass.

• Employee is the superclass.

  Manager is the subclass.

• Neither. Inheritance is not appropriate in this case.

Answer explanation

Because every manager is an employee but not the other way around, the Manager class is more specialized. It is the subclass, and the Employee is the superclass.

Which of the following classes BankAccount, CheckingAccount and SavingsAccount would be the superclass?

(a)  

Answer explanation

CheckingAccount and SavingsAccount both inherit from the more general class BankAccount.

Consider the method doSomething(Car c). Select all vehicle classes from Figure 1 whose objects cannot be passed to this method.

• SUV

• Vehicle

• Truck

• Motorcycle

Should a class Quiz inherit from the class Question?

• Yes

• No

Answer explanation

A Quiz class should not inherit from the class Question. A quiz isn't a question. it has questions.

Which of the following correctly instantiates a new Painter object?

• Painter kahlo = new Painter;

• Painter kahlo = Painter();

• kahlo Painter = new Painter();

• Painter kahlo = new Painter();

Consider the code segment.

What is the name of the superclass?

• Painter

• PainterPlus

• turnAround

• SuperPainter

Answer explanation

The name of the superclass is indicated after the extends keyword. In this example, the superclass is Painter

Fill in the blank. Inheritance represents a/an ___ relationship.

• is-many

• has-a

• is-a

• none of these

Answer explanation

Inheritance represents an is-a relationship. For example, Dog is a Pet.

Consider the code segment. What does it print?

• 2, 4, 8, 16, 32, 64

• 2, 4, 8, 16, 32, 64, 128

• 2, 4, 6, 8, 10, 12, 16, 18, ....100

Which statement below is true regarding the class declarations?

I. Tree is a subclass of Oak

II. Oak is a superclass of Pine

III. Pine is a subclass of Tree

IV. Tree is a superclass of Oak

• III only

• I only

• III and IV

• IV only

Which statement below is true regarding the class declarations?

I. Plant is a subclass of Tree

II. Tree is a superclass of Pine

III. Tree is a subclass of Plant

IV. Pine is a superclass of Tree

• III only

• I only

• III and IV

• II and III