An interface tells that what a class can do. It is a good 
object oriented design to use interfaces in your program. 
When a class implements the interface, it is actually 
contracting to implement all the functionality of the interface. 
Interfaces also support multiple inheritance.

An interface tells that what a class can do. It is a good 
object oriented design to use interfaces in your program. 
When a class implements the interface, it is actually 
contracting to implement all the functionality of the interface. 
Interfaces also support multiple inheritance.