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Java Java Objects (Retired) Harnessing the Power of Objects Throwing Exceptions

im stuck here

symbol: class IllegallArgumentException location: class GoKart ./GoKart.java:23: error: cannot find symbol throw new IllegallArgumentException(???Not enough battery remains???); ^ symbol: class enough location: class GoKart.

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() {

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    int newLaps = mBarsCount - laps
    if (newLaps > MAX_BARS) {
        throw new IllegallArgumentException(Not enough battery remains);
    mBarsCount = newLaps;

  public void charge() {
    while (!isFullyCharged()) {

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

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


1 Answer

Dmitry Ponomarenko
Dmitry Ponomarenko
18,175 Points

I am not sure your condition in "if" statement is right. You're subtracting laps from "mBarsCount", so you should check if bars are not going below zero. Also you used wrong symbol in (“Not enough battery remains”). You should use ", not ” (these symbols are slightly different if you'll look close.

Thanx, i resterted the whole thing again and got it right