Executing Dos-Based Exe files in java

Question

Dear Friends,
I have a plm with running dos based exe files (ping,su)in java through exec method.
My code is
try{
String prg="c:\java\ExePrograms\ping";
Runtime rt=Runtime.getRuntime();
Process p=rt.exec(prg);
}catch(Exception ex){
System.out.println(ex);
when i run this program, no error message is displayed and not the ping program is run.But when i run i window based exe program,it runs fine.
plz tell me,what the plm is.

Answer 1

I try to run su.exe prgm through Runtime.exec()method.Su should prompt the user for login name and password and create a security configuration file in the specified directory.To achieve this,i use the following code
==============================
// OS: win98
//Java version:1.3
try{
Runtime rt=Runtime.getRuntime();
Process p=rt.exec("command.com /c c:\\startSU.bat");
p.waitFor();
}catch(Exception ex){
System.out.println(ex);
===============================
startSU.bat contains the following code
c:\Progs\su.exe -f * -Cg c:\user\secure.sec
when i run this prgm, su window opens but it is empty.It does not prompt the user for login name and password. how should i pass these date to su.exe prgm. plz help me to run su.exe.