如何修复Java程序中的括号？ [关闭]

Question

我的括号有问题，我做错了什么吗？我在某处添加一个括号试图修复错误的所有内容，它要么说我需要一个elseStatment，要么我需要添加另一个括号，当我添加另一个括号时，我得到一个很大的错误，说“无法访问代码”。

如果有人能解释为什么会发生这种情况并帮助我解决它，我将不胜感激。为了向您显示错误发生的位置，我将添加 3 个感叹号。

package me.bukkit.Ragnarok;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

import net.minecraft.server.v1_10_R1.PlayerSelector;

public class StandardFlight extends JavaPlugin {

    @Override
    public void onEnable() {
        getLogger().info("StandardFlight: Flight plugin has been loaded successfully!");

    }

    @Override
    public void onDisable() { 

    } **!!!**

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if (cmd.getName().equalsIgnoreCase("flight") && sender instanceof Player) {
            Player player = (Player) sender;
            if(player.hasPermission("uheal.heal.self")) {

            if (args.length == 0) {
            player.sendMessage(ChatColor.GOLD + "Ops, try " + ChatColor.RED + "/flight on " + ChatColor.GOLD + "or " + ChatColor.RED + "/flight off");
            return true;

            if (args.length == 1) {
            } else  if (args[0].equals("on")) {
                player.setAllowFlight(true);
                player.setFlying(true);
                player.sendMessage(ChatColor.GOLD + "Setting Flight for player: " + ChatColor.RED + player.getName() + ChatColor.GOLD + ChatColor.BOLD + " On!");
                return true;

                if (args.length == 1) {
            } else if (args[0].equals("off")) {
                    player.setAllowFlight(false);
                    player.setFlying(false);
                    player.sendMessage(ChatColor.GOLD + "Setting Flight for player: " + ChatColor.RED + player.getName() + ChatColor.GOLD + ChatColor.BOLD + " Off!");  
                    return true;

            }
            return false;

        }
        {

    }

    }

} **!!!**

Answer 1

这个：

if (args.length == 0) {
     player.sendMessage(ChatColor.GOLD + "Ops, try " + ChatColor.RED + "/flight on " + ChatColor.GOLD + "or " + ChatColor.RED + "/flight off");
     return true;

     if (args.length == 1) {

注意缩进。该代码块只有在args.length 为0 时才能执行，这意味着args.length == 1 可以NEVER 为真。并且由于您在那一秒之前无条件地return，因此您的“无法访问代码”。

所以.. 你可能错过了}：

if (args.length == 0) {
    player.sendMessage(ChatColor.GOLD + "Ops, try " + ChatColor.RED + "/flight on " + ChatColor.GOLD + "or " + ChatColor.RED + "/flight off");
    return true;
} else if (args.length == 1) {
^^^^^^^^^^---NOTE THIS

如果您花时间正确格式化您的代码，这应该很明显。

Answer 2

您有很多问题，但这是我想出的带有适当括号的内容，至少我认为它们是基于我假设您正在尝试做的事情：

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

import net.minecraft.server.v1_10_R1.PlayerSelector;

public class StandardFlight extends JavaPlugin {

    @Override
    public void onEnable() {
        getLogger().info("StandardFlight: Flight plugin has been loaded successfully!");

    }

    @Override
    public void onDisable() { 

    } **!!!**

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if (cmd.getName().equalsIgnoreCase("flight") && sender instanceof Player) {
            Player player = (Player) sender;
            if(player.hasPermission("uheal.heal.self")) {

            if (args.length == 0) {
                player.sendMessage(ChatColor.GOLD + "Ops, try " + ChatColor.RED + "/flight on " + ChatColor.GOLD + "or " + ChatColor.RED + "/flight off");
                return true;
            }
            if (args.length == 1) {

            } else  if (args[0].equals("on")) {
                player.setAllowFlight(true);
                player.setFlying(true);
                player.sendMessage(ChatColor.GOLD + "Setting Flight for player: " + ChatColor.RED + player.getName() + ChatColor.GOLD + ChatColor.BOLD + " On!");
                return true;
                //This code is unreachable because you have a return statement above it. You need to move the code below it. 
                if (args.length == 1) {

                } else if (args[0].equals("off")) {
                    player.setAllowFlight(false);
                    player.setFlying(false);
                    player.sendMessage(ChatColor.GOLD + "Setting Flight for player: " + ChatColor.RED + player.getName() + ChatColor.GOLD + ChatColor.BOLD + " Off!");  
                    return true;

            }
            return false;

        }
    }
}

}

} **!!!**