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Editorial Team
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Asked: 2026-05-25T13:37:45+00:00

I’m working on a small utility class that originally was going to read in

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I’m working on a small utility class that originally was going to read in one of four file types, which I had working. Then I found out that after I know which type of file I”m dealing with, I had to know which operation was to be performed, so the obvious choice was to use two arguments. The problem is I haven’t worked with command line args much and I’ve never had to do multiple args on the command line.

So my questions are: is there some sample code to look at or do I just hack out some procedural code that specifically looks for something at args[0] and then at ags[1]?

Also, I wanted to know how to set the args values when running it under Eclipse so I don’t pass anything in? Like when args is null because I’m not running it on the command line. So I hard code some values in the program itself under an else condition as in:

if(args.length() > 1){
}
else{
//Sets args here.
}

Thanks,
James

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1 Answer

  1. Editorial Team

    There are many Java libraries that offer command line handling, see SO:Java library for parsing command-line parameters. You scenario you described however seems arguably simple enough to just use args directly.

    Note that args is an array, therefore length is not a method: args.length > 1 .. (no brackets)

    In order to set command line arguments in Eclipse have a look at SO:How to make Eclipse prompt me for command line arguments.

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