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

Posted by Nalini Ravikumar
Nalini Ravikumar
1,991 Points

How to solve this problem

Okay, so let's use our new isFullyCharged helper method to change our implementation details of the charge method. Let's make it so it will only charge until the battery reports being fully charged. Let's use the ! symbol and a while loop. Inside the loop increment mBarsCount

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() {
    mBarsCount = MAX_ENERGY_BARS;
  }

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

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

 while (mBarsCount < MAX_ENERGY_BARS)  {
    System.out.printf("Energy BARS", mBarsCount);
   if !(mBarsCount == MAX_ENERGY_BARS)
   {
     mBarsCount++;
   }
 } 

}

1 Answer

markmneimneh
markmneimneh
14,132 Points
markmneimneh
markmneimneh
14,132 Points

Hi

Please be careful with the { } placements

You have

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

while (mBarsCount < MAX_ENERGY_BARS) { System.out.printf("Energy BARS", mBarsCount); if !(mBarsCount == MAX_ENERGY_BARS) { mBarsCount++; } }

I believe it should be (not tested)

    public boolean isFullyCharged() {
        while (mBarsCount < MAX_ENERGY_BARS)  {
                mBarsCount++;
               System.out.printf("Energy BARS", mBarsCount);
        }
        return mBarsCount;
    }

if this answers your question, please mark the question as answered.

Thanks

khem dura
khem dura
934 Points
khem dura
khem dura
934 Points

it didn't work for me but here is my version according to what they taught me on the video.

public boolean isFullyCharged() { boolean isFullyCharged = true; while( mBarsCount != MAX_ENERGY_BARS) { isFullyCharged = false; mBarsCount++; System.out.println(" Batter is fully charged!"); } return isFullyCharged; }