Hello,

Interfaces -

An interface is a contract: The person writing the interface says, "hey, I accept things looking that way", and the person using the interface says "OK, the class I write looks that way".

An interface is an empty shell. There are only the signatures of the methods, which implies that the methods do not have a body. The interface can't do anything. It's just a pattern.

For example (pseudo code):

// I say all motor vehicles should look like this:

interface MotorVehicle

{

    void run();

    int getFuel();

}

// My teammate complies and writes vehicle looking that way

class Car implements MotorVehicle

{

    int fuel;

    void run()

    {

        print("Wrroooooooom");

    }

    int getFuel()

    {

        return this.fuel;

    }

}

Hope this helps.