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

Posted by Nicolas Murrduck
Nicolas Murrduck
Courses Plus Student 366 Points

Looks like you didn't catch the exception.

What i am doing wrong here please somone it keeps saying that i didnt catch the exception

Main.java 
public class Main {
    public static void main(String[] args) {
        GoKart kart = new GoKart("yellow");
        if (kart.isBatteryEmpty()) {
          System.out.println("The battery is empty");
        }
        kart.drive(2);
        try {
          kart.drive(9);
        }   catch  (IllegalArgumentException iae) {
        System.out.printf("%s\n", iae.getMessage());
      }

        }
    }
Nicolas Murrduck
Nicolas Murrduck
Courses Plus Student 366 Points

i figured out myself the mistake was that i didnt include kart.drive in the try braces

Aditya Puri
Aditya Puri
1,080 Points
Aditya Puri
Aditya Puri
1,080 Points

hey!! I don't understand what went wrong in your program..I am having the same problem but when I added "kart.drive(2)" in the try statement, it resolved the problem...I don't understand how this happens.

How is kart.drive(2) invalid argument? There are 8 energy bars. Then how can depleting 2 make a difference?

Steve Hunter
Steve Hunter
57,712 Points

Hi Aditya,

The drive() method can throw an exception. It doesn't have to throw the exception, but the possibility of the exception being thrown must always be caught.

Make sense?

Steve.

Aditya Puri
Aditya Puri
1,080 Points
Aditya Puri
Aditya Puri
1,080 Points

SO, It won't throw the exception in this case but we are making it so that if the "2" were a "9", then it would throw an exception? We are making sure that if it checks for the error?

Steve Hunter
Steve Hunter
57,712 Points

Yes. Exactly that. We would define the method as being able to throw a particualr type of exception. That exception must then be handled whether it arises or not.

2 Answers

Steve Hunter
Steve Hunter
57,712 Points

Hi Nicolas,

The drive method is what can throw the exception. There's no try|catch block around the existing method call, kart.drive(2); which is what the compiler is complaining about.

There's no need to call the method again, just build the exception handling around the code that exists:

      try {
        kart.drive(2);
      } catch (IllegalArgumentException iae) {
        System.out.printf(iae.getMessage());
      }

I hope that helps.

Steve.

Nicolas Murrduck
PLUS
Nicolas Murrduck
Courses Plus Student 366 Points
Nicolas Murrduck
Nicolas Murrduck
Courses Plus Student 366 Points

Yea i figured out Thanks!!! Steve Hunter