如何在Java中为电报机器人键盘编写一组自定义命令？

<dependency>
    <groupId>org.telegram</groupId>
    <artifactId>telegrambots</artifactId>
    <version>5.1.1</version>
</dependency>

import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
import org.telegram.telegrambots.meta.api.objects.Update;
import org.telegram.telegrambots.meta.exceptions.TelegramApiException;

public class MyTelegramBot extends TelegramLongPollingBot {

    @Override
    public void onUpdateReceived(Update update) {
        // 处理接收到的消息
        if (update.hasMessage() && update.getMessage().hasText()) {
            String messageText = update.getMessage().getText();
            long chatId = update.getMessage().getChatId();

            // 根据接收到的消息内容进行处理
            if (messageText.equals("/start")) {
                sendReply(chatId, "欢迎使用自定义命令键盘！");
            } else if (messageText.equals("/command1")) {
                sendReply(chatId, "执行自定义命令1");
            } else if (messageText.equals("/command2")) {
                sendReply(chatId, "执行自定义命令2");
            } else {
                sendReply(chatId, "未知命令");
            }
        }
    }

    private void sendReply(long chatId, String message) {
        SendMessage reply = new SendMessage()
                .setChatId(chatId)
                .setText(message);

        try {
            execute(reply); // 发送回复消息
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }

    @Override
    public String getBotUsername() {
        return "YourBotUsername";
    }

    @Override
    public String getBotToken() {
        return "YourBotToken";
    }
}

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.meta.TelegramBotsApi;
import org.telegram.telegrambots.meta.exceptions.TelegramApiException;

public class Main {
    public static void main(String[] args) {
        ApiContextInitializer.init(); // 初始化API上下文

        TelegramBotsApi botsApi = new TelegramBotsApi();

        try {
            botsApi.registerBot(new MyTelegramBot()); // 注册Bot
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
}