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OOP 2: inheritance, polymorphism, overriding, association, aggregation and composition

AQA 75174.1 L9A-levelLesson packSubscription
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Set it as homework or classwork and every answer is marked as pupils go, with feedback on what they got wrong. The scores go straight into your mark book, so you can see who needs help before the next lesson.

  • 11 questions
  • 31 marks
  • about 35 minutes
  • marked instantly

Question types: short answer, multiple choice, matching, true or false.

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Rect has one constructor, public Rect(int width, int height). A Square is a Rect with equal sides. class Square : Rect { // constructor here } Identify the correct constructor for Square.

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About this resource

AQA A-level Computer Science (7517) 4.1.2.3 Object-oriented programming: inheritance, polymorphism, overriding, aggregation and composition (association is taught as the umbrella term for has-a links: context, not a spec term). C# lesson 9 of 10 in 4.1 Programming: a read-the-classes Do Now, a sh…

15 slides.

Lesson outline

  1. Do Now: read the classes
  2. Do Now: answers
  3. Key idea: Inheritance and overriding
  4. Key idea: Polymorphism, aggregation, composition
  5. Set 1: inherit and extend
  6. Set 2: override and polymorphism
  7. Exam question E1: has-a: which kind?
  8. Model answer E1
  9. Exam question E2: polymorphism
  10. Model answer E2
  11. Set 3: has-a: composition and aggregation
  12. Finished? harder inheritance
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