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

Posted by lee lewis
lee lewis
Courses Plus Student 5,796 Points

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

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

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.