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Thread: Command Line Argument Help

  1. #1
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    Default Command Line Argument Help

     
    	if(args.length <= 0)
                System.out.print("Hello World");
     
    	else if (args.length > 0)			
             {
                System.out.print("Hello ");
                for (int i = 0; i < args.length; i++)
                   System.out.print(args[i] + " ");
     
             }
    	System.out.println();
    (A little background, all I'm doing is replacing "world" if there are command line arguments, with those args)


    How would I, using a variable that has the index of the 2nd passed data argument, with passing in a comm. line arg. such as "java Hello arg1 arg2 arg3 arg4" get the output of "Hello arg3 arg4"?

    Whenever I add in this variable....
    [COLOR="Red"]int indexVar = 2;[/COLOR]
     
    if(args.length <= 0)
                System.out.print("Hello World");
     
    	else if (args.length > 0)			
             {
                System.out.print("Hello ");
                for (int i = 0; i < args.length; i++)
                   System.out.print(args[[COLOR="Red"]indexVar[/COLOR]] + " ");
     
             }
    	System.out.println()
    I get the output of Hello arg3 arg3 arg3 arg3.
    I am assuming this is happening because the for loop is looping system.out for the args length which is 4. But I don't know how to fix that, and keep getting that unwanted output.

    Can you guys be of some help? Thanks.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Command Line Argument Help

    Instead of using indexVar as the index, start counting in your for-loop from indexVar. Also, if this is the method you want, you will probably want to check to see if args.length <= 2 because if you don't, only "hello " will get printed out.

    for (int i = indexVar; i < args.length; i++)
         System.out.print(args[i] + " ");

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    EmSaint (January 28th, 2010)

  4. #3
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    Default Re: Command Line Argument Help

    Thank you very much.

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