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Java Java Objects Harnessing the Power of Objects Handling Exceptions

Posted by james piccola
james piccola
620 Points

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

i feel i did everthing correctly but still get a syntax error.

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.println(iae);
    }    
  }
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;
  }

}
Eric Ward
Eric Ward
4,198 Points
Eric Ward
Eric Ward
4,198 Points

Here you go, just a few minor changes. 

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);
      System.out.println("Error man, check your laps");
    } catch (IllegalArgumentException iae) {
      System.out.println("Whoa there!");
      System.out.printf("The error was %s",
                        iae.getMessage());
    }
  }

}

This should allow you to complete it.