How to open command prompt from a java program

[preddy Narra]

Hi,

How to open command prompt from a java program..

please give me the code..

PC

[Paul Sturrock]

Have a read of the JavaDocs for Runtime.exec. Also, have a search through this forum for references to Runtime.exec. You should find plenty example code.

[Naseem Khan]

Well I tried but none of line 1, 2 or 3 starts a command prompt. I think from command prompt, I am running this program, so thats why it won't start a new process.

import java.io.*;
class Test{
public static void main(String[] args){
try
{
Runtime.getRuntime().exec("cmd");         // Line 1
Runtime.getRuntime().exec("cmd start");   // Line 2
Runtime.getRuntime().exec("command.com"); // Line 3
}
catch (IOException e)
{
e.printStackTrace();
}

}
}

Naseem

[Joe Ess]

What happens if you type those commands into a prompt? Do they open a new command prompt?

[Naseem Khan]

It does nothing. With the above code it does not open a new command prompt.
[ July 11, 2006: Message edited by: Naseem Khan ]

[Joe Ess]

Right. So the problem isn't with Java, it's with your use of the command line. First you should set out to discover what command will create a new window. A simple web search led me to this handy reference. Once you have the command, you'll still need a command interpreter to run it, so your exec line should include a call to it. Let us know what you try and if you are still stumped.

[Naseem Khan]

Hi Joe,

With your reference and little r&d, it worked.

Code below:

Runtime.getRuntime().exec(new String[]{"cmd", "/k", "start", "cmd"});

Thanks
[ August 06, 2006: Message edited by: Naseem Khan ]