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Thread: How to check for shortage of command line arguments

  1. #1
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    Default How to check for shortage of command line arguments

    Hi, how do I check for a shortage of command line arguments entered, I tried this in main and it works, but is that proper coding technique?
    Also, I want to know why it doesn's throw the ArrayIndexOutOfBoundsException to indicate too many command line arguments so how do I
    define this, I am confused. Also, please see the commented out if-block, I want to make sure that when user enters
    pos integers greater than the supported range for an int in Java, that it should give a user friendly error message but that
    if-block doesn't run as I tried to compile it, how do I implement this then? (Note: I noticed that the NumberFormatException seems to catch values exceeding the range for pos integers, but I thought NumberFormatException is to check if in a given string there are non numeric characters...

    Btw: the program for the sum method I written (not included) is supposed to sum the three command line arguments and return the int. (the sum method is for adding pos ints only I want)

    public static void main(String[] args)
    {
      if ( args.length < 3 )
        return;
     
    /**HOW DO I CHECK FOR BOUNDARY VALUES THEN IF THE BELOW IF BLOCK DOESN'T WORK...****/
      /if ( Integer.parseInt(args[0]) > Integer.MAX_VALUE | 
       // Integer.parseInt(args[1]) > Integer.MAX_VALUE |	
       // Integer.parseInt(args[2]) > Integer.MAX_VALUE  ) 
       // {
    	  // System.out.println("Int inputs too large, not supported");
              // return;
         //}
     
      try
      {
         sum(Integer.parseInt[0]);
         sum(Integer.parseInt[1]);
         sum(Integer.parseInt[2]); 
      }
      catch (java.lang.ArrayIndexOutOfBoundsException exception) 
      {
    	System.out.println("T");
       }
      catch (NumberFormatException nfe)//to deal with non-int input
     {
            System.out.println("Inputs cannot be non-integers.");
     }
    }

    Any help appreciated.
    Last edited by IHeartProgramming; January 15th, 2012 at 11:14 PM.


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    Default Re: How to check for shortage of command line arguments

    I tried this in main and it works, but is that proper coding technique?
    Yes, it is.
    Also, I want to know why it doesn's throw the ArrayIndexOutOfBoundsException to indicate too many command line arguments so how do I
    define this, I am confused.
    Coz you return it if it has arguments less than 3. Try removing if(args.length<3) and pass two arguments to experience index out of bound exception.

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