Below is a version of CarTest that uses 
toString() and System.out.println() instead of
printing the fields directly and thus works with the new 
Car class that makes its fields private. 
class CarTest5 {
  public static void main(String args[]) {
    
    Car c = new Car("New York A45 636", 123.45);
    System.out.println(c);
    
    for (int i = 0; i < 15; i++) {
      c.accelerate(10.0);
      System.out.println(c);
    }
  }
    
}