JDA Discord如何在数组中获取对机器人消息做出反应的所有用户名

import net.dv8tion.jda.api.JDABuilder;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.entities.Message;
import net.dv8tion.jda.api.entities.TextChannel;
import net.dv8tion.jda.api.entities.User;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
import net.dv8tion.jda.api.hooks.ListenerAdapter;

import javax.security.auth.login.LoginException;
import java.util.ArrayList;
import java.util.List;

public class MyBot extends ListenerAdapter {
    public static void main(String[] args) throws LoginException {
        JDA jda = JDABuilder.createDefault("YOUR_BOT_TOKEN").build();
        jda.addEventListener(new MyBot());
    }

    @Override
    public void onMessageReceived(MessageReceivedEvent event) {
        if (event.getAuthor().isBot()) return; // 忽略机器人自己发送的消息

        Message message = event.getMessage();
        TextChannel channel = event.getTextChannel();

        if (message.getContentRaw().equalsIgnoreCase("!usernames")) {
            List<String> usernames = new ArrayList<>();
            List<User> mentionedUsers = message.getMentionedUsers();

            // 获取所有被提及用户的用户名
            for (User user : mentionedUsers) {
                usernames.add(user.getName());
            }

            // 将所有用户名发送到文本频道
            channel.sendMessage("被提及的用户名有：" + String.join(", ", usernames)).queue();
        }
    }
}