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 Harnessing the Power of Objects Throwing Exceptions

Ayal Wolf
Ayal Wolf
976 Points
Posted by Ayal Wolf
Ayal Wolf
976 Points

Where do you throw the lapsDriven and barCount exception in the java objects challenge?

The error keeps specifying to place before the barCount and lapsDriven fields are computed. Which makes no sense to me. Need assistance.

GoKart.java 
class GoKart {
  public static final int MAX_BARS = 8;
  private String color;
  private int barCount;
  private int lapsDriven;

  public GoKart(String color) {
    this.color = color;
  }

  public String getColor() {
    return color;
  }
  public void charge() {
    barCount = MAX_BARS;
  }

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

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

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

  public void drive(int laps) {
    lapsDriven += laps;
    barCount -= laps;
    if (barCount < lapsDriven) {
      throw new IllegalArgumentException("Not Enough Bars");
    }
  }  
}

2 Answers

Sharina Jones
PLUS
Sharina Jones
Courses Plus Student 18,771 Points
Sharina Jones
Sharina Jones
Courses Plus Student 18,771 Points

The exception should be thrown where the issue is likely to occur. In this case, the exception would be caused by trying to do more laps than you have bars for. So you want to throw the exception in the drive method:

  public void drive(int laps) {
    //if you want to drive more laps than you have bars for
      //throw exception
    lapsDriven += laps;
    barCount -= laps;
  }

Let me know if you need more help.

Ayal Wolf
Ayal Wolf
976 Points
Ayal Wolf
Ayal Wolf
976 Points

That worked! Thank you for the help.