harnessing the Power of objects please help I have been stuck on this challenge since yesterday.

public class GoKart {
  public static final int MAX_BARS = 8;
  private String mColor;
  private int mBarsCount;

  public GoKart(String color) {
    mColor = color;
    mBarsCount = 0;
  }

  public String getColor() {
    return mColor;
  }

  public void drive() {
    drive(1);
     } catch(IllegalArgumentException iae) {
      System.out.println(iae);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
   if (mBarsCount-laps<=0) {
      throw(new IllegalArgumentException("Not enough battery remains"));
    } 
    mBarsCount -= laps;
  }

  public void charge() {
    while (!isFullyCharged()) {
      mBarsCount++;
    }
  }

  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }

}