//ABSTRACT CLASS vehicle DEFINES INTEGER speed
// AND METHOD getspeed() WHICH ARE INHERITED BY
// ANY (SUB)CLASS WHICH EXTENDS vehicle (e.g., car, boat).
// THE CONSTRUCTOR OF vehicle IS NOT CALLED.  THE SUBCLASS
// USES THE KEYWORD super TO CALL vehicle's CONSTRUCTOR
// vehicle(int x) TO SET THE SPEED OF A VEHICLE.

public abstract class vehicle{

 protected int speed;

 public vehicle(int x){
     speed = x;
  }

 public int getspeed() {
    return speed;
 }
}



//CLASS car IS A SUBCLASS OF vehicle
public class car extends vehicle{
   
   // VARIBLES WHICH ARE PARTICULAR TO A car.
   public int numwheels;
   public int drivers;
 
  // CONSTRUCTOR
  public car(int x, int y){
        super(x);
        numwheels = y;
       }
  // METHOD TO RETURN THE NUMBER OF DRIVERS
  public int drive(int z){
     return (drivers=z);
   }

}


//CLASS boat IS A SUBCLASS OF vehicle
public class boat extends vehicle{
  // VARIABLE WHICH IS PARTICULAR TO boat 
  public String model;


  //CONSTRUCTOR
  public boat(int x, String str){
        super(x);
        model = str;
       }

}





//CLASS vintage IS A SUBCLASS OF car AND ALSO
//OF vehicle
public class vintage extends car{
   //VARIABLES WHICH ARE PARTICULAR TO vintage
   private int year;
   protected String name;
 
  //CONSTRUCTOR
  // super(x,y) CALLS THE CONSTRUCTOR OF car WHICH IN TURN
  // CALLS THE CONSTRUCTOR OF vehicle WITH super(x)

  public vintage(int x, int y, int z, String str){
        super(x,y);
        year = z;
        name = str;
       }

  public int age() {
      return (2001 - year);
      }

}