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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 keywords—public, private, and protected—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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Section 2. Chapter 6
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bookChallenge: Model a Simple Inheritance Hierarchy

Swipe to show menu

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 keywords—public, private, and protected—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!

Section 2. Chapter 6
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