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

Throwing excepctions in java

Ok, im a little stuck here. Im wrapping my drive method in a try block and I think I have the syntax right (it compiles in my local IDE). Can anybody spot the mistake?

Example.java
class Example {

  public static void main(String[] args) {
    GoKart kart = new GoKart("purple");
    if (kart.isBatteryEmpty()) {
      System.out.println("The battery is empty");
    }
    try {
      kart.drive(42);
    }
    catch (IllegalArgumentException iae) {
       System.out.printf("There is not enough charge in the battery to go that many laps: ", 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;
  }

}

1 Answer

andren
andren
28,538 Points

You have forgotten to place a %s placeholder inside of the string you print out. Which means that you don't actually print out the message you get from the exception.

If you add the %s placeholder like this:

System.out.printf("There is not enough charge in the battery to go that many laps: %s", iae.getMessage() ); 

Then your solution will be accepted.

Yep, that's what it was. Thanks bunches!