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Java Java Objects (Retired) Harnessing the Power of Objects Throwing Exceptions

Posted by Jonathan Adams
Jonathan Adams
544 Points

stuck

Not sure what is wrong. The question is asking me to throw an illegal argument if they try to drive a lap without enough battery. Here is what I wrote

public void drive() {

int countBars = MAX_BARS - mBarsCount; //so a new object is 8 - (number of laps) if (countBars > MAX_BARS) { // if countBars is greater than 8 (max bars) throw new IllegalArgumentException("not enough battery"); //throw the method! } drive(1); }

to me it makes sense but i am getting an error telling me to make sure I have it set to throw an error.

GoKart.java 
public class GoKart {
  public static final int MAX_BARS = 8;
  private String mColor;
  private int mBarsCount;

  public GoKart(String color) {
    mColor = color;
    mBarsCount = 0;
  }

  public String getColor() {
    return mColor;
  }

  public void drive() {

   int countBars = MAX_BARS - mBarsCount;
    if (countBars > MAX_BARS) {
      throw new IllegalArgumentException("not enough battery");
    }
    drive(1);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;
  }

  public void charge() {
    while (!isFullyCharged()) {
      mBarsCount++;
    }
  }

  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }

}

1 Answer

Jonathan Adams
Jonathan Adams
544 Points

I was able to figure this one out. Here is the code

public void drive(int laps) { // Other driving code omitted for clarity purposes int countBars = MAX_BARS - mBarsCount; if (countBars > MAX_BARS) { throw new IllegalArgumentException ("Not enough battery"); }