Admin Command

if(label.equalsIgnoreCase("admin")) {
    Player p = (Player) sender;
    if(!adminmode.contains(p)) {
        for(Player pl : Bukkit.getOnlinePlayers()) {
            pl.hidePlayer(p);
        }
        p.setGameMode(GameMode.CREATIVE);
        p.sendMessage(ChatColor.GREEN + "Admin mode enabled");
        adminmode.add(p);
        return true;
    } else {
        for(Player pl : Bukkit.getOnlinePlayers()) {
            pl.showPlayer(p);
        }
        p.setGameMode(GameMode.SURVIVAL);
        p.sendMessage(ChatColor.GREEN + "Admin mode disabled");
        adminmode.remove(p);
        return true;
    }
}