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.