FREE AP CSA Object-Oriented Programming Questions and Answers

Question 1

What is the correct way to create an object from the following class?

Accepted Answer

Car myCar = new Car("Red");

Answer

Car myCar = new Car();

Answer

Car myCar = Car("Red");

Answer

Car myCar = new Car(String color);

Question 2

How does encapsulation improve code quality?

Accepted Answer

By hiding the implementation details of a class.

Answer

By making all class variables public.

Answer

By ensuring all methods are static.

Question 3

What is the output of the following code?

Accepted Answer

Bark

Answer

Some sound

Answer

Error: Animal cannot refer to Dog.

Answer

Both Some sound and Bark

Question 4

Which of the following statements are true about method overloading and overriding?

Accepted Answer

Overloading occurs within the same class.

Answer

Overloaded methods must have different method names.

Question 5

What is true about abstract classes in Java?

Accepted Answer

Abstract classes can have both abstract and non-abstract methods.

Answer

An abstract class must have at least one abstract method.