In object-oriented programming, we can use inheritance when we know there is an “is a” relationship between a child and its parent class. Some examples would be: A person is a human.

Get started with polymorphism in Java and how to do method invocation in polymorphic method calls.

A method might accept a specific type and its subclasses, but you want to restrict usage to a select few implementations of your own design. Java's open inheritance model can feel like an open ...