public void accelerate() {
     System.out.println("car is accelerating");
  }

public void headlightsOn() {
      System.out.println("car's headlights is on");
  }

public void headlightsOff() {
      System.out.println("car's headlights is off");
  }

public int return0dometer(int odometerValue) {
      return 10000; 
  }