runtime class

From: ambika (indambika_at_yahoo.com)
Date: 02/26/04 

Date: 26 Feb 2004 09:42:33 -0800

hello everyone,
I have a small problem using this runtime class..The code below works
fine without any error...

import java.io.*;
import java.lang.Process;
class trial
        {
        public static void main(String args[])throws Exception
                {
                String command[]={"notepad"};
                Runtime r=Runtime.getRuntime();
                Process p=r.exec(command);
                int i;
                i=p.waitFor();
                }
        }

but when i try to run the command "dir" then i get a error like this;

Exception in thread "main" java.io.IOException: CreateProcess: dir
error=0
        at java.lang.Win32Process.create(Native Method)
        at java.lang.Win32Process.<init>(Unknown Source)
        at java.lang.Runtime.execInternal(Native Method)
        at java.lang.Runtime.exec(Unknown Source)
        at java.lang.Runtime.exec(Unknown Source)
        at java.lang.Runtime.exec(Unknown Source)
        at trial.main(trial.java:9)

the code which i tried had nothing changed other than the string
command,which i gave as "dir" instead of "notepad"...and the code in
which i got the error is;

import java.io.*;
import java.lang.Process;
class trial
        {
        public static void main(String args[])throws Exception
                {
                String command[]={"dir"};
                Runtime r=Runtime.getRuntime();
                Process p=r.exec(command);
                int i;
                i=p.waitFor();
                }
        }

Can someone tell me why does this happen???Thanks to all those who are
going to help me out...

-ambika..