02. personal_voice_assistant_'en'.java

// Please note that this is a simplified version of the code and might require additional modifications and
// the inclusion of proper library dependencies to make it fully functional in a Java environment.
// You would also need to replace "YOUR_WEATHER_API_KEY", "YOUR_SPEECH_SUBSCRIPTION_KEY", and "YOUR_SPEECH_REGION" with your actual API keys and subscription information.

import com.microsoft.cognitiveservices.speech.*;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import org.json.JSONObject;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

public class VoiceAssistant {

    private static final String WEATHER_API_KEY = "YOUR_WEATHER_API_KEY";
    private static final OkHttpClient HTTP_CLIENT = new OkHttpClient();
    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);

    public static void main(String[] args) {
        try {
            SpeechConfig speechConfig = SpeechConfig.fromSubscription("YOUR_SPEECH_SUBSCRIPTION_KEY", "YOUR_SPEECH_REGION");
            SpeechRecognizer speechRecognizer = new SpeechRecognizer(speechConfig);
            initializeVoice();

            System.out.println("Listening...");

            Future<SpeechRecognitionResult> task = speechRecognizer.recognizeOnceAsync();
            SpeechRecognitionResult speechResult = task.get();

            if (speechResult.getReason() == ResultReason.RecognizedSpeech) {
                String userCommand = speechResult.getText().toLowerCase();

                if (userCommand.equals("exit")) {
                    speak("Goodbye!");
                } else if (userCommand.equals("time")) {
                    String currentTime = getCurrentDateTime();
                    speak("The current time is " + currentTime);
                } else if (userCommand.startsWith("weather")) {
                    String city = userCommand.substring(7).trim();
                    getWeatherReport(city);
                } else {
                    speak("Sorry, I didn't understand that.");
                }
            }

            speechRecognizer.close();
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }

    private static void initializeVoice() {
        // Initialize voice settings if required
    }

    private static void speak(String text) {
        // Implement text-to-speech functionality here
    }

    private static String getCurrentDateTime() {
        return DATE_FORMAT.format(new Date());
    }

    private static void getWeatherReport(String city) {
        String url = "https://api.openweathermap.org/data/2.5/weather?q=" + city + "&appid=" + WEATHER_API_KEY + "&units=metric";

        Request request = new Request.Builder()
                .url(url)
                .build();

        try {
            Response response = HTTP_CLIENT.newCall(request).execute();
            if (response.isSuccessful()) {
                JSONObject responseBody = new JSONObject(response.body().string());
                double temperature = responseBody.getJSONObject("main").getDouble("temp");
                double humidity = responseBody.getJSONObject("main").getDouble("humidity");
                double windSpeed = responseBody.getJSONObject("wind").getDouble("speed");

                System.out.println("Temperature: " + temperature + "°C");
                System.out.println("Humidity: " + humidity + "%");
                System.out.println("Wind Speed: " + windSpeed + "m/s");
            } else {
                System.out.println("Error occurred while fetching weather data.");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}