Nukkitでプラグイン作成(Java使用)

NukkitPlugin.java

package pjz9n.exampleplugin;

import cn.nukkit.Player;
import cn.nukkit.command.Command;
import cn.nukkit.command.CommandSender;
import cn.nukkit.event.EventHandler;
import cn.nukkit.event.EventPriority;
import cn.nukkit.event.Listener;
import cn.nukkit.event.player.PlayerChatEvent;
import cn.nukkit.event.player.PlayerJoinEvent;
import cn.nukkit.plugin.PluginBase;
import cn.nukkit.utils.Config;
import cn.nukkit.utils.ConfigSection;
import cn.nukkit.utils.TextFormat;

import java.util.Random;

public class Main extends PluginBase implements Listener {

    private Config config;

    @Override
    public void onEnable() {
        this.saveDefaultConfig();

        ConfigSection defaultMap = new ConfigSection();
        defaultMap.set("message", "たくまっち");

        System.out.println(this.getDataFolder());
        this.config = new Config(this.getDataFolder() + "/message.yml", Config.YAML, defaultMap);

        this.getLogger().info("こんにちは、世界");
        this.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler(priority = EventPriority.HIGHEST)
    public void onPlayerJoin(PlayerJoinEvent event) {
        Player player = event.getPlayer();
        String name = player.getName();
        String message = name + "が世界にやってきました";
        event.setJoinMessage(TextFormat.GOLD + message);
    }

    @EventHandler
    public void onPlayerChat(PlayerChatEvent event) {
        Random random = new Random();

        int kekka = random.nextInt(3);
        event.getPlayer().sendMessage(TextFormat.GREEN + "結果: " + Integer.toString(kekka));
        if (kekka == 1) {
            event.setMessage("Nukkitプラグイン完全に理解した!!\n" + TextFormat.AQUA + this.config.get("message"));
        }
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (args.length < 1) {
            return false;
        }
        this.getServer().broadcastMessage(TextFormat.LIGHT_PURPLE + args[0] + "と一緒にお風呂に入ったよ！");
        return true;
    }
}