Duh - I can't see the output because it's in another process??

Question

I've been banging my head, trying to learn how to make Unix scripts and Java work together. At my job there's a lot of that, and I'm an intern and wanting to learn more so I've been playing at home. I have a Linux (RedHat7.2) partition at home, so I get that out in the evenings and play.
I just learned there's a Runtime.exec() that can call applications. Cool. But I wanted to see if I could write a shell script and call that. I can get a regular application like gedit to open up, with
Runtime.getRuntime().exec("gedit");
But following the examples I found on forum searches, I can't get
Runtime.getRuntime().exec("/bin/csh" "/root/testscript.sh") to show any output.
I've been working in a terminal all along, and it just dawned on me that since exec() spawns a process, I could see with ps if it happened. Sure enough, every time I run
java foo
a new csh process starts. But still no output on the terminal. testscript.sh just says
echo Hello world
So I figure that the process is there and it did run the script, but it can't use the current terminal window for its output.
If this is right, is there some way I can add something to foo.java that will kick off a terminal for the new csh process to use for its output?
Thanks, this is fun!

Answer 1

So do you want a new xterm or aterm or Eterm or wterm or what-ever-term window to pop up or just execute the script so that its stdout goes to java's stdout?
This works but it is not complete:      1 import java.io.InputStream;
      2 public class testexec {
      3
      4     public static void main(String[] args) throws Exception {
      5         // Execute command
      6         String[] command = {"/bin/sh", "-e", "/home/myusername/hi"};
      7         Process child = Runtime.getRuntime().exec(command);
      8
      9         // Get input stream to read from it
     10         InputStream in = child.getInputStream();
     11         int c;
     12         while ((c = in.read()) != -1) {
     13             System.out.print((char)c);
     14         }
     15         in.close();
     16     }
     17 }(not complete because in real life there could be output in stderr too, and you need to watch both streams)
and the script file "hi" goes:#!/bin/sh
echo "Hello World!"