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private static final String YOUR_BOT_TOKEN = "YOUR_BOT_TOKEN";

@Override
public String getBotToken() {
    return YOUR_BOT_TOKEN;
}

@Override
public void onUpdateReceived(Update update) {
    if (update.hasMessage() && update.getMessage().hasText()) {
        String messageText = update.getMessage().getText();
        long chatId = update.getMessage().getChatId();

        if (messageText.startsWith("/download")) {
            String videoId = messageText.substring("/download".length());
            String command = String.format("youtube-dl -o \"%%(title)s.%%(ext)s\" https://www.youtube.com/watch?v=%s", videoId);

            try {
                Process process = Runtime.getRuntime().exec(command);
                int exitCode = process.waitFor();
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));

                StringBuilder output = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    output.append(line).append("\n");
                }

                String response = (exitCode == 0) ? "Download successful!" : "Download failed.";

                SendMessage message = new SendMessage()
                        .setChatId(chatId)
                        .setText(response + "\n\n" + output.toString());
                execute(message);
            } catch (IOException | InterruptedException | TelegramApiException e) {
                e.printStackTrace();
            }
        }
    }
}

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

public static void main(String[] args) {
    TelegramBotsApi botsApi = new TelegramBotsApi();

    try {
        botsApi.registerBot(new YouTubeDownloaderBot());
    } catch (TelegramApiException e) {
        e.printStackTrace();
    }
}