Practice Abstraction In Java (4.7) - Introduction to Object-Oriented Programming using Java

Practise this section

9 questions

Flashcard drill
3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is abstraction in Java?
Show hintHide hint
Think about what a user needs to interact with.
Question 2.
Can you instantiate an abstract class?
Show hintHide hint
Consider how we use blueprints.
3Question 3.
What does abstraction help with in programming?
- Hiding details
- Debugging
- Optimization
Show hintHide hint
Think about the user interface.
4Question 4.
True or False: An abstract class can be instantiated.
- True
- False
Show hintHide hint
Recall how blueprints work.
Question 5.
Design an abstract base class for a Shape with methods calculateArea() and draw(). Then create subclasses Circle and Square that implement these methods.
Show hintHide hint
Think about how each shape's area is calculated.
Question 6.
Implement an interface Playable that has a method play(). Create classes VideoGame and Music that implement this interface and provide their own version of play().
Show hintHide hint
Consider what 'play' means in different contexts.

5 more questions in this section. Enroll free to practise them all.