I'm stuck....

I am confused, I understand the purpose of the videos to explain the concepts, but then I got attempt a challenge, but I find myself 9/10 times struggling to begin with because the content isn't the same. That throws me off.

When I try to just grasp the main concepts and apply those to the coding example. It works obviously when I understand it, but it seems that when I implement the same code it doesn't seem to work the same. For example in this current challenge I was using the similar code as provided in the video, tweaking it of course for the variable names.

However, I find I have tons of errors. I am just baffled, and need a little help please.

I understand the concepts, I guess I am having a rough time understanding how to write it all out, and where to put it.

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 isBatteryEmpty() {
    return mBarsCount == 0;
  }

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


}