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Java Java Objects Harnessing the Power of Objects Throwing Exceptions

Make sure you throw a new IllegalArgumentException if the requested amount of laps would make the battery less than zero

public void drive(int laps) { lapsDriven += laps; barCount -= laps; int newDriven = lapsDriven + laps; int newBars = barCount - laps; if ((newDriven > MAX_BARS) && (newBars < 0)){ throw new IllegalArgumentException(" Too Many Bars."); } lapsDriven = newDriven; barCount = newBars; }

GoKart.java
class GoKart {
  public static final int MAX_BARS = 8;
  private String color;
  private int barCount;
  private int lapsDriven;

  public GoKart(String color) {
    this.color = color;
  }

  public String getColor() {
    return color;
  }
  public void charge() {
    barCount = MAX_BARS;
  }

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

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

  public void drive() {
        drive(400);
  }   


public void drive(int laps) {
    lapsDriven += laps;
    barCount -= laps;
    int newDriven = lapsDriven + laps;
    int newBars = barCount - laps;
    if ((newDriven > MAX_BARS)  && (newBars < 0)){
      throw new IllegalArgumentException(" Too Many Bars.");
    }
    lapsDriven = newDriven;
    barCount = newBars;
  }

}