stuck on the challenge

Question

Don't know what to put in the if statement

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);
    if () {
      throw new IllegalArgumentException("Not enough battery remains");
    }
  }

  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;
  }

}

Answer 1 · 2016-09-29T00:41:15Z

September 29, 2016 12:41am

Hey,

The first issue is you are throwing the error in the wrong method. I am throwing an error if I don't have enough battery to complete the number of laps asked. This means I need to know the number of laps being asked. Since the method is void it doesn't return anything, and it also doesn't take anything. it doesn't take arguments, so there isn't a way for that method to know how many laps you are suppose to do, thus it can't know if it has enough battery.

If you look at the other drive method, that takes arguments. In fact it takes the number of laps as an argument. This is where I want to throw my exception.

If (mBarsCount < laps) -- This says that if the amount of bars in your battery is less than the number of laps, there is no way I can run all the laps being asked. So in that if statement I throw the IllegalArgumentException. In the event that Say I have 4 bars of battery and I need to do 3 laps Than mBarsCount is not less than laps and I can subtract the number of laps from my battery and everything is good.

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

Does this make sense? If not, let me know!

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1 Answer

Ryan Ruscett

Ryan Ruscett