Polymorphism
Polymorphism (continued)
Polymorphism and References
Note !
Abstract Classes
Abstract Classes (continued)
Abstract Class Example

Abstract Classes (continued)
You cannot instantiate an object of an abstract class type; can only declare a reference variable of an abstract class type
You can instantiate an object of a subclass of an abstract class, but only if the subclass gives the definitions of all the abstract methods of the superclass