Run java program on separate VM and see the output

Use the input stream of the process:

Process p = Runtime.getRuntime().exec();
java.io.InputStream in = p.getInputStream();

int r;
while ((r=in.read()) != -1) System.out.write(r);

Thanks!

And if I want it to print it on a seperate window thatn the one that I'm running?
Or to put it into a JTextArea?

you can wrap the input stram with a reader and append the read content to the JTextArea content:


javax.swing.JTextArea textArea;

Process p = Runtime.getRuntime().exec();
java.io.InputStream in = p.getInputStream();
java.io.BufferedReader reader = new java.io.InputStreamReader(in); // wrapping the stream

String r;
while ((r=reader.readLine()) != null) // the reading is slightly changed
    textArea.append(str + "\r\n");

Hi again!
And last thing, how can I redirect the output of my java program to a JTextArea (I don't have the Process object)?

This is even easier

The only thing you ahve to do is to reset the default System.out or System.err strems to the ones you want with the method

System.setOut();
System.setErr();

See the API for the System class to see what I mean.

thanks pouli!
...but how can I connect between this and the JTextArea?