Learn the four types of polymorphism in Java, ... For example, a car rolls down the road, ... This example assumes the class structure shown in Listing 5 and instantiates Superclass and Subclass.

Polymorphism in method overriding. It’s possible to change the return type of an overridden method if it is a covariant type. A covariant type is essentially a subclass of the return type. Here ...