Swing GUI for Javadoc

Question

Hi everyone,
I'm trying to learn some basic IO and Swing. My project is to make a Swing GUI for javadoc. It's supposed to run at least under W2K and XP.
The Swing part is going fine, but I can't seem to get IO-part working.
I tried working with the Runtime- and the Process-class, but I don't can't seem to execute javadoc or read any command-line output. Here's a sample of code that compiles ok, but doesn't do anything.
try {
Process p = Runtime.getRuntime().exec("javadoc");
InputStream in = p.getInputStream();
String s = in.toString();
System.out.println(s);
System.out.println();
System.out.println(process.waitFor());
System.out.println();
System.out.println(process.exitValue());
System.out.println();
System.out.println(""+process);
} catch (Exception e) {
System.out.println("error");
if anyone has any tips, suggestions or simple code samples, I would be very happy to hear from you.

Answer 1

Alright, I figured out how to read the inputstream, but
I still get an error:
Windows 2000
start
<ERROR>
javadoc: No packages or classes specified.
and the program doesn't terminate for some reason.
here's the new sourcecode:
import java.io.*;
public class JavaDocCommander {
     public static void main(String[] args) {
          System.out.println(System.getProperty("os.name"));
          System.out.println("start");
          new Test();
          System.out.println("slut");
class Test{
     public Test(){
          try {           
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("javadoc");
InputStream stderr = proc.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;
System.out.println("<ERROR>");
while ( (line = br.readLine()) != null)
System.out.println(line);
System.out.println("</ERROR>");
int exitVal = proc.waitFor();
System.out.println("Process exitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();