Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Objects Harnessing the Power of Objects Throwing Exceptions

Bolatito Seriki
Bolatito Seriki
1,170 Points

Add logic to the drive method so that it throws an IllegalArgumentException if there aren't enough bars to support the l

I've tried every method but it's still wrong. can someone pls help me with the answer

GoKart.java
'''java class GoKart { public static final int MAX_BARS = 8; private String color; private int barCount; private int lapsDriven;

public GoKart(String color) { this.color = color; }

public String getColor() { return color; } public void charge() { barCount = MAX_BARS; }

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

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

public void drive() { drive(1); }

public void drive(int laps) { if(laps>barCount){ throw new IllegalArgumentException(); } lapsDriven += laps; barCount -= laps; } '''

1 Answer

Simon Coates
Simon Coates
4,912 Points

Seemed to accept

  public void drive(int laps) {
    if(barCount - laps <=0)
    {
      throw new IllegalArgumentException();
    }
    lapsDriven += laps;
    barCount -= laps;
  }

I thought it might be an boundary condition, but it passed for me with:

if(laps > barCount) throw new IllegalArgumentException(); 

as well. So I tried copy and paste with your method and it worked.

I think

if(laps > barCount) throw new IllegalArgumentException(); 

Is the best approach , and should work absolutely fine.