Unable to create directory

    I`m trying to create a directory for each URL string read in from
a file. However, one of the directories cannot be created, but the
other can. Neither exist at the start. No exception occurs.

    Am I missing something obvious? (I have not used mkdir before.)

    I am running on the Windows Vista OS. Thanks, Alan

Output:

http://www.weather.gov/
Creating directory www.weather.gov . . .
Unable to create directory www.weather.gov
http://www.cnn.com/
Creating directory www.cnn.com . . .

Code:

import java.io.*;
import java.lang.*;

public class create_directory
{
   public static void main ( String[] args ) throws IOException
   {
      try
      {
         BufferedReader infile = new BufferedReader(new
FileReader("URLs.txt"));

         String aURL, directory;

         while ((aURL = infile.readLine()) != null)
         {
         System.out.println(aURL);
        directory = (aURL.replace("http:","")).replace("/","");
        System.out.println("Creating directory " + directory + " . . .");
        try
        {
           if ((new File(directory).mkdir()) == false)
          System.out.println("Unable to create directory " + directory);
        }
        catch (SecurityException e) {e.printStackTrace();}
         }
         infile.close();
      }
     catch (IOException e) {e.printStackTrace();}
   }

}