1  public class Car extends Vehicle

  2  {

  3     // This instance variable is added to the subclass

  4     private String licensePlateNumber;

  5     

  6     public Car()

  7     {

  8        // Use the public interface to access the instance variable of the superclass

  9        setNumberOfTires(4); // same as this.setNumberOfTires(4)

 10        licensePlateNumber = "??????";

 11     }

 12  

 13     // This method is added to the subclass

 14     public void setLicensePlateNumber(String newValue)

 15     {

 16        licensePlateNumber = newValue;

 17     }

 18  

 19     // This method overrides a method from the superclass

 20     public String getDescription() 

 21     {

 22        return "A car with license plate " + licensePlateNumber;

 23     }

 24  

 25     // This class inherits the getNumberOfTires and setNumberOfTires methods

 26  }