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Java Java Objects Harnessing the Power of Objects Increment and Decrement

Herry Suvandy
Herry Suvandy
1,745 Points

it said "Oops! It looks like Task 1 is no longer passing." why ?

i already follow the instruction , but why it keep showing "Oops! It looks like Task 1 is no longer passing"

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

  public void boolean drive(){
  lapsDriven += 1;

  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;

2 Answers

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,252 Points

Hi Herry,

Let's first look at the question in the code challenge.


You're asked to create a new private int field named lapsDriven, as you've done.

The problem starts in your drive method. You're trying return a boolean data type where none is needed. It's also asking you to use the post increment shorthand operator which is ++. The same as writing lapsDriven = lapsDriven + 1;

  public void drive(){

Finally you'll need to decrement the barCount private int field in the same way, in the same method. Hope this helps :)

Herry Suvandy
Herry Suvandy
1,745 Points

holy potatoes....i get it now..., thanks a lot