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bookChallenge: Model a Simple Inheritance Hierarchy

Recap: Inheritance, Visibility, and Overriding

You have learned that inheritance allows you to create a new class based on an existing one, using the extends keyword. This lets you reuse code and build logical relationships between classes. Visibility keywordsβ€”public, private, and protectedβ€”control which properties and methods are accessible from outside or inside the class and its subclasses. Method overriding lets a subclass provide its own implementation of a method defined in its parent class.

You are now ready to apply these concepts by modeling a simple class hierarchy representing animals and their behaviors.

Task

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Create a class hierarchy to model animals and their sounds.

  • Define a base class Animal with a public method speak() that outputs a generic message.
  • Define a subclass Dog that extends Animal and overrides speak() to output a dog-specific sound.
  • Define a subclass Cat that extends Animal and overrides speak() to output a cat-specific sound.

Solution

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SectionΒ 2. ChapterΒ 6
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bookChallenge: Model a Simple Inheritance Hierarchy

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Recap: Inheritance, Visibility, and Overriding

You have learned that inheritance allows you to create a new class based on an existing one, using the extends keyword. This lets you reuse code and build logical relationships between classes. Visibility keywordsβ€”public, private, and protectedβ€”control which properties and methods are accessible from outside or inside the class and its subclasses. Method overriding lets a subclass provide its own implementation of a method defined in its parent class.

You are now ready to apply these concepts by modeling a simple class hierarchy representing animals and their behaviors.

Task

Swipe to start coding

Create a class hierarchy to model animals and their sounds.

  • Define a base class Animal with a public method speak() that outputs a generic message.
  • Define a subclass Dog that extends Animal and overrides speak() to output a dog-specific sound.
  • Define a subclass Cat that extends Animal and overrides speak() to output a cat-specific sound.

Solution

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Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 6
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