Runtime.exec() doubt, please help me...........

[karthick chinnathambi]

import java.io.*;
public class Main
{

public static void main(String[] args)throws IOException
{
    Process p=Runtime.getRuntime().exec("cmd.exe");
    
    BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream()));

    String s;
    while((s=br.readLine())!=null)
    System.out.println(s);
    p.destroy(); 
}
}    

when i execute this new cmd window is not opening.....
but "cmd.exe" process runs inside taskmanager.....

my aim is to go to d:\somefolder using cmd console and cmd window should be visible....
can i execute the commands to be executed in cmd using java program?
if not tell me an alternate way.... please........

also when the program completes the process is not killed......