Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Michelle Bramlett
Michelle Bramlett
1,253 Points
Posted by Michelle Bramlett
Michelle Bramlett
1,253 Points

Incrementing Challenge

Keep getting the error Use ++ to increment the mBarsCount member field

Thought that is what I did. Any insight?

GoKart.java 
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() {
    while (!isFullyCharged()) {
      mBarsCount ++;
    }
  }

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

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

}

2 Answers

andren
andren
28,558 Points
andren
andren
28,558 Points

Your code is technically fine, but the code checker for these challenges can be quite picky. If your code does not look exactly how it expects it to look it will often mark it as wrong.

The problem in this case is that the challenge checker expects your increment line to look like this:

mBarsCount++;

Notice that there is no space between the variable name and the ++, while it is valid in Java to have a space between them it is more common to not have a space, and therefore the code checker expects there to be no space.

In short all you need to do to complete the challenge is to remove the space in your incrementing code.