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

Ramis Khan
Ramis Khan
767 Points
Posted by Ramis Khan
Ramis Khan
767 Points

how to do this?

question-lets use our new isFullyCharged helper method to change our implementation details of the charge method.Letsmake it so it will only charge until the battery reports being fully charged. Lets use the ! symbol and a while loop. Inside the oop increment mBarsCount.

the error im getting is- ./GoKart.java:27: error: incompatible types: int cannot be converted to boolean return mBarsCount; ^ 1 error

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() {
    while (!isFullyCharged()){
  mBarsCount++;
      if (mBarsCount==MAX_ENERGY_BARS){
        return mBarsCount;
      }
    }
  }
}

1 Answer

Alistair Mackay
Alistair Mackay
7,812 Points
Alistair Mackay
Alistair Mackay
7,812 Points

The wording on the question kind of threw me a bit.

You want to take what you've written so far and apply it to the charge() method. While it is not (!) fully charged you want to increment mBarsCount++.

Below is the following code that worked for me. try it if you get really stuck.

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;
  }

}