plugin.yml Olmadan basit ve hızlı komut ekleme | Çok şey destekliyor

public Commands(JavaPlugin plugin) {

        CommandManager manager = new CommandManager(plugin);

        manager.register("gamemode")
       
                .aliases("gm", "gamem", "mode")
                .commandType(CommandType.PLAYER) //komut tipi, panel ? oyuncu ? her ikisi ?
                .permission("gamemode.permission")
                .noPermissionMessage("§cYou do not have permission to this command!")
                .description("gamemode permission")
                .usage("/gamemode 0, 1, 2, 3")
                .arguments(1, 1, plugin.getMsg().getPrefix() + "§cUsage: /gamemode 0, 1, 2, 3") //girilebilecek min ve max argüman uzunluğunu ve hata mesajını ekliyoruz
               
                .tabCompleter((sender, args) -> {
                    if (args.length == 1) {
                        return Arrays.asList("0", "1", "2", "3");
                    } else if (args.length == 10) {
                        return Collections.singletonList("gamemode 10 huh?");
                    }
                    return new ArrayList<>();
                })
               
                .playerExecutor((sender, args) -> {
                    Player p = (Player) sender;
                    switch (Integer.parseInt(args[0])) {
                        case 0:
                            p.setGameMode(GameMode.SURVIVAL);
                            p.sendMessage("§eYour game mode has been changed to §asurvival!");
                            break;
                        case 1:
                            p.setGameMode(GameMode.CREATIVE);
                            p.sendMessage("§eYour game mode has been changed to §acreative!");
                            break;
                        case 2:
                            p.setGameMode(GameMode.ADVENTURE);
                            p.sendMessage("§eYour game mode has been changed to §aadventure!");
                            break;
                        case 3:
                            p.setGameMode(GameMode.SPECTATOR);
                            p.sendMessage("§eYour game mode has been changed to §aspectator!");
                            break;
                        default:
                            p.sendMessage("§cUsage: /gamemode 0, 1, 2, 3");
                    }
                })
               
                .register();
    }