/**
   Represents an automobile.
*/

public class Auto extends Vehicle
{
   private String licensePlate;

   public Auto(String vin, String plate)
   {
      super(vin);
      licensePlate = plate;
   }

   public boolean equals(Object _a)
   {
      Auto a = (Auto)_a;
      return licensePlate.equals(a.licensePlate) && super.equals(a);
   }
}