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Thread: Java won't load.

  1. #1
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    Exclamation Java won't load.

    Why won't this work? after being compiled.
    public class Add {
     
       public static void main(String[] args) {
          int a = Integer.parseInt(args[0]), b = Integer.parseInt(args[1]);
          System.out.println(a + " + " + b + " = " + (a + b));
       }
     
    }

    Untitled.jpg
    Last edited by NewMember; February 18th, 2013 at 01:27 AM. Reason: indentation


  2. #2
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    Default Re: Java won't load.

    The error means String[] args is empty but you're trying to get values from it. Even if String[] args contained something that could be converted to an integer, you would still receive compiler errors because you cannot initialize variables on the same line using your approach. That is:

    public class Add {
       public static void main (String[] args) {
           int a, b, sum;
           int[] myArray = {1, 2};
           a = myArray[0];
           b = myArray[1];
           sum = a + b;
           System.out.println(a + " + " + b + " = " + sum);
         }
    }

  3. The Following User Says Thank You to SunshineInABag For This Useful Post:

    NewMember (February 18th, 2013)

  4. #3
    Super Moderator Norm's Avatar
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    Default Re: Java won't load.

    The code should test if the args array has anything in it before trying to use it. Use the array's length attribute.
    If args.length is >= 2 then the code can get args[0] and args[1]
    If the length is < 2 print out an error message and exit.
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    NewMember (February 18th, 2013)

  6. #4
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    Default Re: Java won't load.

    Alright thanks for the quick response, it seems to be working.

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