Totally lost, DOS through java

Question

I am trying to run ftp in DOS by using the following code, only its not working, when I run the program it opens the DOS window but nothing happens, it does run but returns me two the command prompt straight away. If anyone can help it would be great, thanks in advance.
import java.io.*;
class DosCmd{
public static void main(String [] args){
     String cmd = "Notepad.bat";
try{
     Runtime rt = Runtime.getRuntime();
     Process child = rt.exec("start ftp /c ftp 172.20.2.134");
     child.waitFor();
     catch(IOException io){}
     catch(InterruptedException e) {}

Answer 1

Try changing the line:
Process child = rt.exec("start ftp /c ftp 172.20.2.134");
To:
Process child = rt.exec("cmd.exe /c start ftp 172.20.2.134");