Automobiles with functions (methods seemed outside) as Stop, Run forward, Run reverse. This is what is needed for the driver to interact with the car. Cars may have an object engine driver but does not need to be concerned. All you need to care about is the functionality to be able to operate the vehicle. Therefore, when replacing a different engine, drivers still use the old function to operate the car for as long as the function (method) provides outside (Interface) is not changed.
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