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Java Java Objects Harnessing the Power of Objects Handling Exceptions

Protect the call to kart.drive by handling the IllegalArgumentException that is thrown when not enough battery remains.

Protect the call to kart.drive by handling the IllegalArgumentException that is thrown when not enough battery remains. Print out the message from the exception to the screen as you catch the exception.

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");
    }
   // kart.drive(42);
  }
   try { 
  kart.drive(42); 
  } catch (IllegalArgumentException iae) { 
  System.out.printf(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;
  }

}

i know that it's a bit late but this worked for me:

try{ kart.fill(42); System.out.println("haha are you kidding?"); }catch(IllegalArgumentException iae){ System.out.println("calm down"); System.out.printf("The error was %s", iae.getMessage()); } } }

5 Answers

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.println(iae.getMessage()); } }

}

// i was using the printf to get the message but was getting errors. System.out.printf ("the error was %d",iae.getMessage());.

so please use the println, like the way i did.

Matthew Kaplan
Matthew Kaplan
9,226 Points

You have an Extra " ; " right above the try function

hi teamtreahouse ; this work for me

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.println(iae.getMessage()); } }

}

Leandro Botella Penalva
Leandro Botella Penalva
17,618 Points

Hi Hermant,

Try using System.out.println instead of System.out.printf. The last one is used for printing formatted Strings.