public class AutoMSG {

    static Main plugin;
    public AutoMSG(Main m) {
        plugin = m;
    }

    public static void start() {
        new BukkitRunnable(){
            int i = 0;
            List<String> Messages = plugin.getConfig().getStringList("messages");
            String prefix = plugin.getConfig().getString("prefix");

            public void run() {
                if(i < Messages.size()) {
                    for(Player players : Bukkit.getOnlinePlayers()) {
                        players.sendMessage(ChatColor.translateAlternateColorCodes('&', prefix + " " + Messages.get(i)));
                    }
                    i++;
                }else {
                    i = 0;
                }
            }
        }.runTaskTimer(plugin, 20L * plugin.getConfig().getInt("time"), 20L * plugin.getConfig().getInt("time"));
    }
}