Reinventing wheels?

Although the sample code implemented tick synchronization between worker thread and robot thread, the use of token may not be necessary, since Java already had similar mechanism.

    worker = new Thread(() -> {
      try {
        while (true) {
          Thread.sleep(1000);
        }
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
      }
    });

call worker.interrupt() whenever you don't need it anymore, or just wait robocode to call that method for you.

It's more likely a sign of the state of Java (or the author's knowledge of it) at the time the page was drafted. It looks like the original is over 10 years old.

Besides Toad, do any bots actually make use of multithreading? I've always felt the community considered it to be a "dirty" tactic.