how to detect usb device connected to system using java code

Hi Friends,

Here's d code..

import java.io.*;

/**
* Waits for USB devices to be plugged in/unplugged and outputs a message
*
*
*@author Ujjwal Soni
*@version 1.0, 16/04/2009
*/
public class FindDrive
{
/**
* Application Entry Point
*/
public static void main(String[] args)
{
String[] letters = new String[]{ "A", "B", "C", "D", "E", "F", "G", "H", "I"};
File[] drives = new File[letters.length];
boolean[] isDrive = new boolean[letters.length];

// init the file objects and the initial drive state
for ( int i = 0; i < letters.length; ++i )
{
drives[i] = new File(letters[i]+":/");

isDrive[i] = drives[i].canRead();
}

System.out.println("FindDrive: waiting for devices...");

// loop indefinitely
while(true)
{
// check each drive
for ( int i = 0; i < letters.length; ++i )
{
boolean pluggedIn = drives[i].canRead();

// if the state has changed output a message
if ( pluggedIn != isDrive[i] )
{
if ( pluggedIn )
System.out.println("Drive "+letters[i]+" has been plugged in");
else
System.out.println("Drive "+letters[i]+" has been unplugged");

isDrive[i] = pluggedIn;
}
}

// wait before looping
try { Thread.sleep(100); }
catch (InterruptedException e) { /* do nothing */ }

}
}
}