I am getting error

I am learning java. I need a program which reads directory name from a file and creates a directory. At the first phase, i wanted to see that the directory is created. Once I succeed in it, i would like to next phase and make it read a file, take a directory name and create a directory. However, I am getting an error. Could you please help me find out the error:

the code is:

import java.io.*;

public class Discfree {

public static void main (String [] args) throws IOException {

String [] Command = null;

Command = new String[2];

Command[0] = "md c:\\javatstdir";

// Command[1] = "";

Process Findspace = Runtime.getRuntime().exec(Command);

BufferedReader Resultset = new BufferedReader(

new InputStreamReader (

Findspace.getInputStream()));

String line;

while ((line = Resultset.readLine()) != null) {

System.out.println(line);

}

}

}

[951 byte] By [ksharmaa] at [2007-11-27 5:35:07]
# 1
For some reason my psychic powers aren't working today. You'll just have to tell us what the error is the old-fashioned way
georgemca at 2007-7-12 15:03:53 > top of Java-index,Java Essentials,Java Programming...
# 2
>Could you please help me find out>the errorYes, take a look in stdout.Cheers
_helloWorld_a at 2007-7-12 15:03:53 > top of Java-index,Java Essentials,Java Programming...
# 3
Command = new String[2];Command[0] = "md c:\\javatstdir";// Command[1] = "";NullPointerException?
cotton.ma at 2007-7-12 15:03:53 > top of Java-index,Java Essentials,Java Programming...