/**
* This method checks both elevators to determine if one is on the floor where this passenger is
* attempting to board.
*
* <p>It returns a reference to the elevator or a null if no elevator is available.
*
* @return available elevator or a null if no elevator is available.
*/
private static Elevator findElevator(Passenger passenger) {
Elevator foundElevator = null;
if (elevator1.isElevatorHere(passenger)) {
foundElevator = elevator1;
} else if (elevator2.isElevatorHere(passenger)) {
foundElevator = elevator2;
}
return foundElevator;
} // end findElevator
