Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Objects (Retired) Harnessing the Power of Objects Throwing Exceptions

IllegalArgumentsException

The challenge text is:

"Okay, so let's throw an IllegalArgumentException from the drive method if the requested number of laps cannot be completed on the current battery level. Make the exception message "Not enough battery remains". "

I am really lost!

have tried:

if (laps > mBarsCount){
    throw new IllegalArgumentException iae("Not enough battery remains");
 }

"If there is more laps than bars, then throw exception", right?

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 (laps < mBarsCount){
    throw new IllegalArgumentException iae("Not enough battery remains");
    }
  }

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

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

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

}

2 Answers

Logan R
Logan R
22,989 Points

You are SUPER close!

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

You need to remove the iae. iae is for when you throw the actual exception. Also, make sure you check before you decrement your mBarCount.

Thanks!

luis martinez
luis martinez
2,480 Points

THANK YOU THANK YOU I BEEN WORKING ON THIS FOR ONE HOUR. THANKS FOR THE BIG HELP

Logan R
Logan R
22,989 Points

No problem :)