Interfaces

• Similar in concept to Inheritance.

• defines behavior. So we have an object and right after it is a biiiig barrier, this barrier is the interface

• The barrier serves as to limit on how we interact with the object. We use an interface to work with an object.

• I tell the class that the object has to meet the requirements imposed by interface. Say I have a class Dog. The dog has the following behaviors which are:

  • walk()
  • woof()
  • eat()

• We can define the behaviors thanks to interfaces. All in all, interfaces define behavior/characteristics that classes need to implement.

• We can define how an animal eats/walks within the interface. Then the class can implement the interface.

• A class does not extend an interface, it implements it. Whenever we work with multiple classes as a team of developer. We must believe that every developer will do their part to implements the works of the interface of the designated class they are working on.

• Say for example, a class that implements the interface walking well then we can trust that class that it can walk properly and not limp.

• An interface can extend interfaces but cannot extend/implement the class.