interface

Interface vs. Class

• A class can implement multiple interfaces
• the shape of a thing, without specifying identity or implementation
• class is a collection of data and methods - strict and closed
• if a Bird can Fly() then all birds must fly, but what about penguins?
• So, define interface ICanFly and ICanSwim, and then Bird can focus on the specifics of the creature
• injecting interfaces creates looser coupling in Dependency Injection