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Java Java Objects (Retired) Harnessing the Power of Objects Incrementing

Where to write code?

I created a new public boolean method "Charged" , but the code is not working. Should I be adding in the code to a different method?

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

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

  public String getColor() {
    return mColor;

  public void charge() {
    mBarsCount = MAX_ENERGY_BARS;

  public boolean charged(){
    boolean isCharged = false;
    while(!isFullyCharged()) {
      mBarsCount ++;
      isCharged = true;
    return isCharged;

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

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


1 Answer

Jason Anders
Jason Anders
Treehouse Moderator 145,858 Points

Hey Sierra,

You're really close, but you have a spacing error. There cannot be a space between the variable and the ++ operator. So you just need to remove the space, as shown here:


Also, just a note. The ++ operator is deprecated in Xcode 7.3 (Swift 3). It is replaced with

mBarsCount += 1;

Keep Coding! :dizzy: