TelegramNotifier.java

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class TelegramNotifier {

    private static final String BOT_TOKEN = ""; // from BotFather
    private static final String CHAT_ID = "";    // your ID

    public static void sendMessage(String message) {
        try {
            String urlString = "https://api.telegram.org/bot" + BOT_TOKEN + "/sendMessage";
            String data = "chat_id=" + CHAT_ID + "&text=" + java.net.URLEncoder.encode(message, "UTF-8");

            URL url = new URL(urlString);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            try (OutputStream os = conn.getOutputStream()) {
                os.write(data.getBytes(StandardCharsets.UTF_8));
            }

            conn.getInputStream().close();
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}