How can i make the results of dos command print to text area in a gui????

Question

I need to get the results from a command line application to print in a text area located in a gui... i have the following code written, which should run the command... if run from a dos window, the command prints the list of what's in a jar file to the screen.... i want that info that is printed to go in a text area which i have named textBox which is global to the program.. i know textBox.appends() is what i should use but how do i retrieve the info from the dos window to put in the appends method?
The code is below for the method..
Thanks,
DH
     /*     Runs the DOS Command for listing a JAR File     */
     public void jarList ( ) // Needs To Be Fixed!!
          listFieldText = listField.getText();
          String command;      
          command = "jar tf " + listFieldText;
          System.out.println(command);
          Runtime rt = Runtime.getRuntime();
          try
               Process child = rt.exec(command);
               child.waitFor();
               System.out.println("Process exit code is: " + child.exitValue());
          catch(IOException e)
               System.err.println("IOException starting process!");
          catch(InterruptedException e)
               System.err.println("Interrupted waiting for process!");
}

Answer 1

Replace child.waitFor()with:          BufferedReader br=new BufferedReader(new InputStreamReader(child.getInputStream()));
          String s="";
                while((s=br.readLine())!=null) {
                    textbox.append(s);
                }Mark