public class ModelX extends Car {

  boolean autopilot = false;

public void drive switchAutopilotOn() {
  autoPilot = true;
  System.out.println("Autopilot is switched on");
}

public void drive switchAutopilotOff() {
  autoPilot = false;
  System.out.println("Autopilot is switched off");
}

public String returnCarModel() {
  return "car model is Modelx";
}
}