I want to launch a process from Java, read its output, and get its return code. But while it's executing, I want to be able to cancel it. I start out by launching the process:

ProcessBuilder pb = new ProcessBuilder(args);
pb.redirectErrorStream(true);
Process proc = pb.start();

If I call proc.waitFor(), I can't do anything until the process exits. So I'm assuming I need to something like this:

while (true) {
  see if process has exited
  capture some output from the process
  decide if I want to cancel it, and if so, cancel it
  sleep for a while
}

Is this right? Can someone give me an example of how to do this in Java?

java multithreading
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