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Java Java Objects Harnessing the Power of Objects Handling Exceptions

Bernard Bond
Bernard Bond
3,302 Points

No clue why this code is not working for the Handling Exceptions challenge!

Here is my code. Is there something I am missing with this code?

public class Example { public static void main(String[] args) { GoKart kart = new GoKart("yellow"); if (kart.isBatteryEmpty()) { System.out.println("The battery is empty"); } try { kart.drive(2); } catch (IllegalArgumentException e) { System.out.println(e.getMessage()); } } }

Example.java
public class Example {
    public static void main(String[] args) {
        GoKart kart = new GoKart("yellow");
        if (kart.isBatteryEmpty()) {
          System.out.println("The battery is empty");
        }
      // wrap potentially dangerous code in the try block
      try {
        kart.drive(2);
      } 
      // catch an illegal argument exception e and use e to get the message
      catch (IllegalArgumentException e) {
        System.out.println(e.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;
  }

}

2 Answers

Umesh Ravji
Umesh Ravji
42,361 Points

[Edit] Leaving the value as 42 looks to be the requirement.

Hi Bernard, your code is correct. However, the value of 2 that you are supplying to the drive() method is too small to actually throw the IllegalArgumentException, since MAX_BARS is 8 to begin with. Just use a big enough number to cause the exception to be thrown.

Bernard Bond
Bernard Bond
3,302 Points

Oh wow. lol Simple error. Thanks! It worked.

Umesh Ravji
Umesh Ravji
42,361 Points

Actually I think I'm wrong in my reasoning, trying to understand this problem.. the value passed in has to be 42, it can't be any lower or higher.