bukkitstaff.java

    @EventHandler
    public void onCommandPreprocess(PlayerCommandPreprocessEvent event) {

        Player sender = event.getPlayer();
        if (set.contains(event.getMessage())){

            sender.sendMessage(ChatColor.DARK_GREEN + "+------------------------------+");
            sender.sendMessage(ChatColor.DARK_AQUA + event.getMessage() + " is awesome!");
            sender.sendMessage(ChatColor.DARK_GREEN + "+------------------------------+");
            event.setCancelled(true);
        } else {
            sender.sendMessage("nope");
        }


    }