Question

嗨，我正在为我和一些朋友制造一个小型的minecraft服务器，我有一段时间没有使用Java了，即时通讯使用spigot 1.14.1 btw。遗憾的是，即使我运行了第一个命令并知道我的UUID在HashMap中，我的containsKey（）也会返回false。如果有人可以解释的话，那将是很好的，如果可能的话，除了解释之外，还可以修改我的代码版本：) 非常感谢您。

我尝试使自己的包含布尔值无法正常工作

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import me.melorn.com.pineapplegang.mc.chatutility.Prefix;
import me.melorn.com.pineapplegang.mc.programutility.HashMapUtility;

public class TempYannick implements CommandExecutor{

    private static Location joejoespawn;

    private HashMap<UUID, Location> OLDLOCATIONS = new HashMap<UUID, Location>();

    public boolean onCommand(CommandSender sender, Command cmd, String label, String args[]) {
        if(sender instanceof Player) {
            Player player = (Player) sender;
            if(cmd.getName().equalsIgnoreCase("joejoe")) {
                this.OLDLOCATIONS.put(player.getUniqueId(), player.getLocation());
                player.sendMessage(Prefix.getPineappleCore() + Prefix.getChatPrefix() + Prefix.getChatColor() + " You have ben teleported to " + Prefix.getPlayerNameColor() + "JoeJoe's" + Prefix.getChatColor() + " Creative Universe");
            }else if(cmd.getName().equalsIgnoreCase("joejoeback")) {
                if(this.OLDLOCATIONS.containsKey(player.getUniqueId())) {
                    this.OLDLOCATIONS.remove(player.getUniqueId());
                    player.sendMessage(Prefix.getPineappleCore() + Prefix.getChatPrefix() + Prefix.getChatColor() + " You teleported back to your old location away from " + Prefix.getPlayerNameColor() + "JoeJoe's " + Prefix.getChatColor() + " Creative Universe");
                }else {
                    player.sendMessage(Prefix.getPineappleCore() + Prefix.getChatPrefix() + Prefix.getChatColor() + " You cant teleport back from " + Prefix.getPlayerNameColor() + "JoeJoe's" + Prefix.getChatColor() + " Creative Universe if you have not ben there!");
                }
            }
        }
        return false;
    }
}

我希望containsKey（）将返回true，以便将“您传送回您的旧位置”消息发送给播放器。

即使UUID在HashMap中，为什么containsKey（）返回false？

0 个答案: