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Time estimate: 90 min.

9.1. Inheritance, Superclass, Subclass

In this lesson, you will learn how to use inheritance to create subclasses that extend superclasses.

• 9.1.1. Inheritance (Day 1)
• 9.1.2. Subclass extends Superclass
• 9.1.3. Why Use Inheritance?
• 9.1.4. is-a vs. has-a (Day 2)
• 9.1.5. is-a Substitution Test
• 9.1.6. Programming Challenge : Online Store
• 9.1.7. Summary

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