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Thread: command line arguments

  1. #1
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    Default command line arguments

    Hi Everybody

    I had a question regarding command line input.
    What i'm trying to do is run a program based on arguments from the command line.

    The entire line to be read in is:
    //java -jar sort1.jar -fres/p -tsorttype=v -ssort
    This is what I have so far:
    public static void main(String[] args)
    	{
    		//if substring equals t then do sorttype
    		//pick out the arguments from each item
    		//if -f then pick out file
    		//if -
     
    		//java -jar sort1.jar -fres/p -tsorttype=v -ssort
    		Testing t = new Testing();
     
    		String file = args[0];
    		for (String s: args)
    		{
    			if (args[0].equals(arg0))
                            {
                               //perform file operation
                           }
                             	if (args[1].equals(arg0))   
                                   {
                                        perform sort type
                                  }
    		}
     
     
    		//String path = args[1];
    		String compare = args[1];
    		String sort = args[2];
    		char method2;
    		//System.out.println(path);
    		if (compare.contains("-h"))
    		{
    			method = 'h';
    			//Testing.readIn(path);
     
    		}
    		else if (compare.contains("-a"))
    		{
    			method = 'a';
    		}
     
    		else if (compare.contains("-v"))
    		{
    			method = 'v';
    		}
     
    		if (compare.contains(sort))
    		{
    			method2 = 't';
    		}

    I've been trying to tear this apart for days but have no idea. Can someone please help. I tried looking in the javadoc but there are no examples.

    Thanks
    Riz


  2. #2
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    Default Re: command line arguments

    Not sure how relevant it is, but I touched on doing a command line argument in a post of mine awhile ago.

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  3. #3
    Super Moderator copeg's Avatar
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    Default Re: command line arguments

    What exactly is the problem?

  4. #4
    Super Moderator helloworld922's Avatar
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    Default Re: command line arguments

    I believe he's asking about passing command line arguments to his program rather than using his program to call a command-line function.

    As copeg stated, what problem are you running into?

    Right away I can tell you have a few grammatical errors with your code. You're trying to access arg0 which doesn't exist.
    if (args[0].equals(arg0))
                            {
                               //perform file operation
                           }
                             	if (args[1].equals(arg0))   
                                   {
                                        perform sort type
                                  }

    Perhaps you meant an actual string, such as -fres?

    Try this instead:

    if (args[0].equals("-fres"))
                            {
                               //perform file operation
                           }
                             	if (args[1].equals("-fres"))   
                                   {
                                        perform sort type
                                  }

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