//------------------------------------------------------------------------
//  class  Motorcycle – inheritance
//------------------------------------------------------------------------

public class Motorcycle extends MotorVehicle {

  protected int numberWheels = 2;

  public Motorcycle()
  {
  }
  // constructors
  public Motorcycle(String licensePlate, double maxSpeed,
   String make, String model, int year, int numberOfPassengers) {
    this(licensePlate, 0.0, maxSpeed, make, model, year, numberOfPassengers);
  }

//  public Motorcycle(String licensePlate, double speed, double maxSpeed,
//   String make, String model, int year, int numberOfPassengers) {
//    this(licensePlate, speed, maxSpeed, make, model, year,
//     numberOfPassengers);
//  }

  public Motorcycle(String licensePlate, double speed, double maxSpeed,
   String make, String model, int year, int numberOfPassengers) {

    // invoke superclass constructor
    super(licensePlate, speed, maxSpeed, make, model, year,
     numberOfPassengers);
  }
  public int getNumberOfWheels() {
    return this.numberWheels;
  }
}