9.1.2 Quiz: Subclasses and Superclasses

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Questions and Answers

What type of relationship do we have when we talk about two classes having a Superclass/Subclass relationship?

  • Consists Of
  • Is A (correct)
  • Has A
  • Can Be

Which keyword do we use to establish the inheritance relationship between a subclass and a superclass?

extends

Is 'Is A' relationships symmetrical?

False (B)

What types of things do we put in the Superclass?

<p>Common Attributes and Behaviors</p> Signup and view all the answers

Which of the following best describes a Subclass / Superclass relationship?

<p>Dog / Animal</p> Signup and view all the answers

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Study Notes

Superclass and Subclass Relationships

  • A Superclass/Subclass relationship is defined by "Is A" relationships, categorizing instances based on their type.
  • The keyword extends is used in programming languages, like Java, to establish inheritance from a superclass to a subclass.
  • "Is A" relationships are not symmetrical, meaning that while a Dog is an Animal, the reverse (Animal is a Dog) is not true.

Characteristics of Superclasses

  • Common attributes and behaviors of related classes are placed in the Superclass, serving as a shared foundation for subclasses to inherit from.
  • The Subclass/Superclass relationship allows for code reusability and a hierarchical structure in object-oriented programming.

Example of Subclass/Superclass

  • A practical example of a Subclass/Superclass relationship is Dog as a Subclass of Animal, illustrating how specific entities derive properties from a more general category.

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