Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Objects Harnessing the Power of Objects Computed Properties

Jamal Nasir
Jamal Nasir
4,318 Points

The Challenge Task is asking me to create a public method called IsBatteryEmpty, which I did. Still getting an error.

It is supposed to return true or false,

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

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

  public String getColor() {
    return color;

  public boolean IsBatteryEmpty(int barCount) {
    if(barCount == 0)
      return true;
    else return false;

  public void charge() {
    barCount = MAX_BARS;

Hi Jamal. What is the error you're getting?

I see a couple things that you could try updating. One would be to add brackets to the method. An example found here: https://www.learnjavaonline.org/en/Conditionals Also I don't think that IsBatteryEmpty needs parameters.

2 Answers

Simon Coates
Simon Coates
4,912 Points

Becky Hirsch is right about not needing parameters. The other problem is that it wants isBatteryEmpty rather than IsBatteryEmpty.

Callum Birks
Callum Birks
3,345 Points

To consolidate the two above answers, your method name should start with a lowercase letter. And rather than passing barCount in as a parameter, you should be comparing "this.barCount", because the method you are writing has access to the barCount variable.