Must-do problems: Polymorphism

140 min · Beginner

Every problem here asks you to design a small class family where one call does different work for different objects. Read the input into a parent-type variable or array, let each child override only what differs, write @Override on every override, and run every test before opening a hint.

What you will learn

Design a parent class whose methods each child overrides with its own rule
Keep shared steps in a parent method that calls overridable methods
Extend a parent rule with super.method() through a chain
Combine overloading and overriding in one class family

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