错误getPlayer（args [0]）;_java

我编写了这段代码，如果您输入：MC中的/ gmspec我应该将您的游戏模式设置为观众模式。 但是它唯一说的是：“尝试执行此命令时发生内部错误。”。 在控制台中它说：arrayindexoutofboundsException：0 ...请帮助，我不知道是什么问题...

    if (commandLabel.equalsIgnoreCase("gmspec")) {


        Player p = (Player) sender;
        Player target = Bukkit.getServer().getPlayer(args[0]);


        if (args.length == 0) {
            p.setGameMode(GameMode.SPECTATOR);
            p.sendMessage(ChatColor.GREEN + "Your own gamemode has been changed!");
            return true;
        }

        if (target == null) {
            p.sendMessage(ChatColor.RED + "The player " + target.getName() + " is not online!");
            return true;

        }
        target.setGameMode(GameMode.SPECTATOR);
        target.sendMessage(ChatColor.GREEN + "Your gamemode is set to Spectator mode. You are not a banaan that just tries every command without any permission...");

        if (sender.hasPermission("gamemode.spectator")) {

            p.sendMessage(ChatColor.RED + "You banaan. Y u still try? U no permission has u dumb shit");
        }
        if (sender instanceof ConsoleCommandSender) {


        }


    }
    return true;
}

您的问题是，尝试获取参数后要检查其长度。 在尝试获取参数之前，必须确保有一个或多个参数，否则将获得

另外，您将需要在将命令发送方强制转换为Player之前检查该命令发送方是否为实际Player 。 如果不执行此操作，则只能从Player上运行任何命令。

为了解决这个问题，你可以取代每p.sendMessage()与sender.sendMessage()并且只投sender到Player如果sender instanceof Player

因此，您的代码可能看起来像这样

if(commandLabel.equalsIgnoreCase("gmspec")){
    if(args.length == 0 && sender instanceof Player){//check if the sender is a Player
        Player p = (Player) sender; 

        p.setGameMode(GameMode.SPECTATOR);
        p.sendMessage(ChatColor.GREEN + "Your own gamemode has been changed!");

        return true;
    }
    else{
        Player target = Bukkit.getServer().getPlayer(args[0]);

        //the rest of the code
    }
}

错误getPlayer（args [0]）;

问题描述

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