SJSU/Udacity CS046

Lesson 9 - Interfaces and Inheritance

  1. Quiz: Unifying Common Behavior
  2. Defining an Interface Type
  3. Implementing an Interface Type
  4. Quiz: Converting from Class to Interface
  5. Quiz: House Equals New Dog
  6. Quiz: Drawable Equals New Drawable
  7. Quiz: Drawable Equals New Rectangle
  8. Quiz: Polymorphism
  9. Quiz: A Second Interface
  10. Quiz: Instanceof Test and Cast
  11. Quiz: What If We Forget to Check the Type?
  12. When Casting Goes Wrong
  13. Quiz: Using Interfaces for Algorithm Reuse Average Area
  14. Quiz: Average Mileage
  15. Quiz: Average Anything
  16. Quiz: Largest Anything
  17. Quiz: Casting the Largest Back to a Country
  18. Compare To
  19. Quiz: Strings Are Comparable
  20. Quiz: Implementing Comparable
  21. Quiz: Inheritance
  22. Quiz: The Quiz Hierarchy
  23. Quiz: A Subclass
  24. Quiz: Implementing Subclass Methods
  25. Quiz: Setting the Answer
  26. Quiz: The Display Method
  27. Quiz: Can We Mix Question Types?
  28. Mixing Question Types
  29. Quiz: Which Display Method Is Called?
  30. Quiz: The Right Display Method Is Called
  31. Quiz: Numeric Question
  32. Summary

Quiz: What If We Forget to Check the Type?

  1. The program will run the same as before.
  2. The houses move even though they should remain stationary.
  3. There will be a compile-time error because Drawables can't be cast to Moveable
  4. There will be a runtime error because Drawables can't be cast to Moveable
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