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 Throwing Exceptions

i dont know what is the problem

i'm confused

GoKart.java
public class GoKart {
  public static final int MAX_BARS = 8;
  private String mColor;
  private int mBarsCount;

  public GoKart(String color) {
    mColor = color;
    mBarsCount = 0;
  }

  public String getColor() {
    return mColor;
  }

  public void drive() {
    drive(1);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes

    mBarsCount -= laps;
    if(mBarsCount<0){
      throw new IllegalArgumentException("Not enough battery");  
    }

  }

  public void charge() {
    while (!isFullyCharged()) {
      mBarsCount++;
    }
  }

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

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

}

1 Answer

Corey Johnson
PLUS
Corey Johnson
Courses Plus Student 10,192 Points

You are very close! Good job. But you need to change a few things. First you do not want to modify the mBarsCount if the amount of laps passed in would throw the exception. So do the check first. Second.. you do not want mBarsCount to be negative, so change your check like below:

public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    if(laps > mBarsCount) {
          throw new IllegalArgumentException("Not enough battery remains");
    }
    mBarsCount -= laps;
  }

Hope this helps!