countdown usage

CountDown countdown = new CountDown([the plugin object], [the number counting down from], [the number of ticks per count])
{
    @Override
    protected void onCount(CountDown countDown, int currentCount)
    {
        if(currentCount == 1)
            for(Player player : Bukkit.getOnlinePlayers())
                player.sendMessage("One minute to go!");

        // Any other per-count code.
    }

    @Override
    protected void onFinish(CountDown countDown)
    {
        for(Player player : Bukkit.getOnlinePlayers())
            player.sendMessage("Ta-da!!");
    }
};

countdown.run();