Using command prompt through java, help please!

Question

Hi,
What I am trying to do is find all the processes running onthe computer using java. Normally, I would do this (without java) by opening a command prompt window, typing in tasklist and see all the running processes. I have tried to to do the same thing using java, but so far have been unsucsessful. Here is my code:
import java.io.*;
public class Main {
        static DataOutputStream output;
        static DataInputStream input;
        static String app="cmd.exe";
        static String command="tasklist";
        static String message="";
        public static void main(String args[])throws Exception{
        Process process = Runtime.getRuntime().exec(app);
        output=new DataOutputStream(process.getOutputStream());
        input=new DataInputStream(process.getInputStream());
        output.write(command.getBytes());
        byte[] b=new byte[input.available()];
        input.readFully(b);
        message=new String(b);
        System.out.println("Message: "+message);
        System.out.println(!message.equals(""));
        System.out.println(message!=null);
        System.out.println("Finished Program");
}And this program prints the output (with no exceptions):
Message:
false
true
Finished Program
I appreciate any help in fixing my program...

Answer 1

DevRocks_Java wrote:
static String app="cmd.exe";
static String command="tasklist";
Process process = Runtime.getRuntime().exec(app);
output=new DataOutputStream(process.getOutputStream());
input=new DataInputStream(process.getInputStream());What do you expect it to do? You are only telling it to open a console window, nothing more.
if you can type tasklist at the run option, then you should be able to just substitute command in for app in your exec.