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/**
     * Self test for Communicator.
     * Derrick McMillen, Spring 2012
     * Please don't submit your solution with my testcase in it. kkthxbai.
     *
     * Watchout for a case where you join a blocked thread last - it will
     * block the terminal which is no fun.
     *
     * For example, 3 speakers and 2 listeners where the last thread joined
     * is a speaker. The blocked speaker is the last thread. Not very dirigent!
     */
    public static void selfTest() {
        KThread socrates = new KThread(new Philosopher("Socrates", 12));
        KThread pythagoras = new KThread(new Philosopher("Pythagoas", 5));
        KThread heraclitus = new KThread(new Philosopher("Heraclitus", 7));

        Philosopher ar = new Philosopher("Aristotle");
        Philosopher pl = new Philosopher("Plato");
        Philosopher th = new Philosopher("Thales");

        KThread plato = new KThread(pl);
        KThread aristotle = new KThread(ar);
        KThread thales = new KThread(th);

        socrates.fork();
        pythagoras.fork();
        heraclitus.fork();

        plato.fork();
        aristotle.fork();
        thales.fork();

        socrates.join();
        pythagoras.join();
        heraclitus.join();

        plato.join();
        aristotle.join();
        thales.join();
    }

private static class Philosopher implements Runnable {
        public static Communicator comm = new Communicator();
        public String name;
        public Integer msg;
        public String heard = "";

        public Philosopher(String name) {
            this.name = name;
        }

        public Philosopher(String name, Integer msg) {
            this(name);
            this.msg = msg;
        }

        public void run() {
            if(msg != null) {
                comm.speak(msg.intValue());
                System.out.printf("%s says %d \n", name, msg.intValue());
            } else {
                int h = comm.listen();
                heard += h + ", ";
                System.out.printf("%s heard %d \n", name,  h);
            }
        }
    }