A independant pile for communication

Dear all,

   I'm trying to have a main class that has an Automaton. This one works
and studies a problem: that may take a very long time. This automaton
has a Communicator with Javascript reduced to a minimum. In short:
----------------------------------------------------
public class Communicator{
  JSObject derivedInnerHTML;

  public Communicator (JSObject win){
    this.derivedInnerHTML = (JSObject)
        win.eval("document.getElementById('derived')");
     }

  public void CommDerived(String quoi){
    derivedInnerHTML.setMember("innerHTML", quoi);
    }

  public void CommPlusDerived(String quoi){
     derivedInnerHTML.setMember("innerHTML",
derivedInnerHTML.getMember("innerHTML") + quoi);
     }
   }
-----------------------------------------------------------------
And many other things of the same flavor.

   I would like this communicator to be on another Thread that would
behave like a pile ... In the automaton I would write sleep(100)
regularly, and that would do the trick.
   All my trials amounted finally to nothing :(

   I could create a pile of message, create a Thread and have this pile
being read and displayed in run() with a wait() if the pile is empty and
a notifyAll() when the pile is fed.
   I'm just wondering whether there is a simpler or more usual way to
address this issue.
   Many thanks in advance!
   Amities,
            Olivier