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 Harnessing the Power of Objects Handling Exceptions

ahmed abdelnaser
ahmed abdelnaser
5,261 Points

Please tell me what is the error here?

i do not know what error is.

Example.java
class Example {

  public static void main(String[] args) {
    try{
    GoKart kart = new GoKart("purple");
    if (kart.isBatteryEmpty()) {
      System.out.println("The battery is empty");
    }
    kart.drive(42);
    } catch (IllegalArgumentException iae){
     System.out.println(iae.getMessage()); 
    }
  }

}
GoKart.java
class GoKart {
  public static final int MAX_BARS = 8;
  private int barCount;
  private String color;
  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) {
    if (laps > barCount) {
      throw new IllegalArgumentException("Not enough battery remains");
    }
    lapsDriven += laps;
    barCount -= laps;
  }

}
ahmed abdelnaser
ahmed abdelnaser
5,261 Points

thank you very much for your help and i really appreciate your advice.

1 Answer

Teacher Russell
Teacher Russell
16,873 Points

Hi Sir, I strongly recommend watching the video some more, and I"m sure you'll understand. First of all, too much of the code here is wrapped in the try/catch block. We're trying the drive method and catching the Illegal Argument Exception if we don't have enough power. It'll look like
try{ kart.drive(42); } catch(IllegalArgumentException iae){ System.out.println(iae.getMessage()); } It will be a good idea to understand this stage as deeply as possible, because it will come back in the second half, and will be a little more complex:) Good luck! Happy Coding! https://docs.oracle.com/javase/tutorial/essential/exceptions/throwing.html