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

Andrea Kim
Andrea Kim
653 Points

I am having trouble making the try-catch block work on the Java Objects exercise.

I thought I was following directions, but I can't find a solution. Have tried to search but nothing seems to work. (the site keeps disconnecting too, which is not helpful.)

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 purpose.

    try { 
      drive(9);
    } 
      catch (IllegalArgumentException e) {
      System.out.println("Not enough battery remains.");   
    }

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

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

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

}

2 Answers

John Paige
John Paige
7,436 Points

Hey Andrea. This is how i passed it

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

That particular challenge is actually just asking to add the "if" and "throw new" statements. The next one will ask for a "Try" and "Catch" statement.

Anyway, I created "int moreLaps" using the "mBarsCount" variable and adding the parameter, "laps".

The really tricky part is that i ended up having to write "moreLaps is less than MAX_BARS" for my "if" statement. I'm still figuring out why it works that way.

Andrea Kim
Andrea Kim
653 Points

Thank you! That worked.

John Paige
John Paige
7,436 Points

You're welcome, anytime.