Am I writing the throw command wrong?

Question

I get 'symbol missing' errors. Which symbol am I missing?

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
   int mBarsCount = mBarsCount - laps;
    if(mBarsCount < 0){
      throw IllegalArgumentException("Not enough battery remains");
    }
  }

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

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

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

}

Answer 1 · 2015-07-05T22:16:54Z

July 5, 2015 10:16pm

Hi Tara,

That's a good attempt! There are a few things that need to be fixed.

// mBarsCount is already defined. remove the int type here
int mBarsCount = mBarsCount - laps;

// this is close, but we need to throw a 'new' error
throw IllegalArgumentException("Not enough battery remains");

// check if mBarsCount is already at zero before attempting to subtract from it
// if mBarsCount <= 0, throw error, else decrement mBarsCount

Cheers

Answer 2 · 2015-07-05T22:20:29Z

July 5, 2015 10:20pm

throw needs an Exception object (actually a Throwable object, which Exception is a subclass of) to throw. You need to use the new keyword to create the exception you want to throw.

throw new IllegalArguemntException("message");

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Tara Edwards

Tara Edwards

Am I writing the throw command wrong?

2 Answers

Robert Richey

Robert Richey

Seth Kroger

Seth Kroger