Use the following files:

Auto.java

/**
   Represents an automobile
*/

public class Auto implements Movement
{
   private String carModel; 
   private String licensePlate; 
   private int position; 

   public Auto(String model, String licenseNum)
   {
      carModel = model;
      licensePlate = licenseNum;
      position = 0;
   }
   
   /**
      Moves the auto to a new position
      @param distance incremental amount to move
   */
   public void move(int distance)
   {
      position += distance;
   }
   
   /**
      Returns the current position of the auto
      @return current position
   */
   public String getPosition()
   {
      return carModel + " at position " + position;
   }
}

MovementTester.java

/**
   Tests the Auto and Ship classes and their
   use of the Movement interface.
*/

public class MovementTester
{
   public static void main(String[] args)
   {      
      Movement myAuto = new Auto("Nissan Altima","JKX14R");
      myAuto.move(35);
      Movement myShip = new Ship(45,"Sea Serpent");
      myShip.move(60);
      System.out.println(myAuto.getPosition() + ", " + myShip.getPosition());
      System.out.println("Expected: Nissan Altima at position 35, Sea Serpent at position 60");
   }

   private void moveAuto(Auto anAuto, int distance)
   {
      anAuto.move(distance);
   }

   private void moveShip(Ship aShip, int distance)
   {
      aShip.move(distance);
   }
}

Ship.java

/**
   Represents a ship.
*/
public class Ship implements Movement
{
   private int sizeInFeet; 
   private String boatName; 
   private int position;

   public Ship(int size, String name)
   {
      sizeInFeet = size;
      boatName = name;
      position = 0;
   }

   /**
      Moves the ship to a new position
      @param distance incremental amount to move
   */
   public void move(int distance)
   {
      position += distance;
   }
   
   /**
      Returns the current position of the ship
      @return current position
   */
   public String getPosition()
   {
      return boatName +" at position " + position;
   }
}