[Java] Print output of shell command

[Sikh]

So Im working on a little project right now and currently im trying to run a shell command under java.

Everything works great, except I cant print the output of the shell command until its completely done executing. For this example / testing im using the rsync command in bash. How can I get java to print out whats happening in shell?

This code is running in its own method and in another thread so the ActionListener I add to the button that'll execute it wont hold it up. Its working like I expect except for it not printing right away. A lot of stuff online says to redraw / update, but i've done both to my Text Area and nothing.

Any ideas guys?

Code:

// Trial Code

   String shellcommand = new String("");
   shellcommand = "time rsync -Phav /Users/sikh/Downloads/ /Users/sikh/Desktop/Test";

   Runtime run = Runtime.getRuntime();
   Process cmdProcess = null;

   try {
	cmdProcess = run.exec(shellcommand);
	} catch (IOException e) {
	 e.printStackTrace();
	}

   try {
	cmdProcess.waitFor();
   } catch (InterruptedException e) {
	e.printStackTrace();
   }

   BufferedReader reader = new BufferedReader(new InputStreamReader(cmdProcess.getInputStream()));
   String line = "";
   try {
	while ((line = reader.readLine()) != null)
	{
	 mainclass.setText(line);
	} // end while
	} catch (IOException e) {
	 e.printStackTrace();
	} // end try

// End Trial Code
[/CODE]