Implement the classes based on the class diagram below which consist of a base

class called Vehicle, and Boat and Plane as derived classes of Vehicle. The

child classes inherit the vehicle method, but override them.

A vehicle object display "Moving" when its move $()$ method is called

A Boat object display "Sailing" when its move $()$ method is called

A Plane object display "Flying" when its move $()$ method is called

Test the classes and their corresponding polymorphic methods