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

what does this mean???

dont know what this means

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() {
    drive(1);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;
    if (mBarsCount < 1) {
      throw new IllegalArgumentException("Not enough battery remains");
    }
  }

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

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

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

}

1 Answer

Hi Lee,

You need to see if laps is greater than mBarsCount. If it is, throw the exception; else do the deduction:

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

Make sense?

Steve.