Get the directory of the entry file

From: Allan Bruce (allanmb_at_TAKEAWAYf2s.com)
Date: 06/30/04 

Date: Wed, 30 Jun 2004 12:44:21 +0100

Is it possible to get the directory of the file that contains my main()? I
have a few data files in a subdirectory within this directory and I want to
access them like this:

public static final String myDataSubdir = "Data\\";
public static final String myDataFile = "Data1.txt";

// access the file using the below as my String
// myMainDirectory + myDataSubdir + myDataFile

Thanks
Allan