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Java Java Objects Harnessing the Power of Objects Handling Exceptions

on this for 20 min?!?!?! little help here????

no idea what to do can someone help me?

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);
  }

}
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

Chris Jones
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.a{fill-rule:evenodd;}techdegree seal-36
Chris Jones
Java Web Development Techdegree Graduate 23,921 Points

Hey Alex,

The drive method can throw an IlegalArgumentException, so to handle this exception (if it's thrown) you need to wrap the main method's call to kart.drive(42) in a TRY-CATCH block.

Hopefully that points you in the right direction?. Let me know if you have any more questions!

I got it now thanks so much for your help!!

Mihai Craciun
Mihai Craciun
13,520 Points

your main method should look like this

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());
    }
  }

}