小编Juk*_*ker的帖子

我只是开始用IntelliJ IDEA在Java中用一些简单的函数来编写Discord Bot。现在我确实有一个问题，我必须为特定功能使用语言级别8，但是当我这样做时，它给我一个错误，以前没有任何工作现在可以正常工作。

码：

package main;
import net.dv8tion.jda.core.AccountType;
import net.dv8tion.jda.core.JDABuilder;
import net.dv8tion.jda.core.entities.Member;
import net.dv8tion.jda.core.events.guild.voice.GuildVoiceJoinEvent;
import net.dv8tion.jda.core.events.message.MessageReceivedEvent;
import net.dv8tion.jda.core.hooks.ListenerAdapter;
import net.dv8tion.jda.core.entities.Role;
import net.dv8tion.jda.core.entities.User;
import java.util.List;
import javax.security.auth.login.LoginException;

public class Main extends ListenerAdapter {

public static void main(String[] args) throws LoginException {
    JDABuilder builder = new JDABuilder(AccountType.BOT);

    String token = "Token of bot which i dont want to show here";

    builder.setToken(token);

    builder.addEventListener(new main.Main());

    builder.buildAsync();
}

@Override
public void onMessageReceived(MessageReceivedEvent event) {
    System.out.println("We received a message from " +
            event.getAuthor().getName()+": "+ event.getMessage().getContentDisplay());

    if(event.getMessage().getContentRaw().equals("!ping")) …