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

Damjan Vlaic
Damjan Vlaic
19,244 Points

---JAVA---

my question is this ---> "Add logic to the drive method so that it throws an IllegalArgumentException if there aren't enough bars to support the laps request. Remember it takes 1 bar of energy to go around a lap." This is my code for now, pls help :)

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;
  }
}

1 Answer

Hi there,

You want to test if the value passed into the method, laps, is greater than barCount. If it is, throw a new IllegalArgumentException. Then else, run the existing lines of code.

So, before you do anything to lapsDriven or barCount, test the size of laps.

I hope that helps,

Steve.

Damjan Vlaic
Damjan Vlaic
19,244 Points

ahaa i i get it now, tnx for help Steve ;)

No problem - glad you got it sorted. :+1: