Intermediate module

Module 8: Object-Oriented Design in Practice

Turn basic classes into clearer designs by choosing the right abstraction, keeping responsibilities small, and using polymorphism with purpose.

Module lessons

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Learn how to choose between a shared base class and a shared contract without over-designing your class model.

See why small collaborator objects often produce cleaner code than deep inheritance trees.

Override methods safely, keep behavior predictable, and avoid breaking code that uses the parent type.

Replace repeated type checks with objects that know how to do their own job.

Build a small shape system that combines abstraction, composition, and polymorphism in a practical way.