Weather App Written In Java

WeatherApp.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WeatherApp extends JFrame {
    private JTextField locationField;
    private JTextField temperatureField;
    private JLabel conditionLabel;

    public WeatherApp() {
        setTitle("Weather App");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        // Feature 1: Location input
        JLabel locationLabel = new JLabel("Location:");
        locationField = new JTextField(15);

        // Feature 2: Fetch button
        JButton fetchButton = new JButton("Fetch");

        // Feature 3: Condition display
        JLabel conditionTextLabel = new JLabel("Condition:");
        conditionLabel = new JLabel();

        // Feature 4: Temperature display
        JLabel temperatureLabel = new JLabel("Temperature:");
        temperatureField = new JTextField(15);
        temperatureField.setEditable(false);

        fetchButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String location = locationField.getText();
                if (!location.isEmpty()) {
                    String apiKey = "aba6ff9d6de967d5eac6fd79114693cc";
                    String apiUrl = "https://api.openweathermap.org/data/2.5/weather?q=" + location + "&appid=" + apiKey;
                    try {
                        URL url = new URL(apiUrl);
                        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                        connection.setRequestMethod("GET");

                        int responseCode = connection.getResponseCode();
                        if (responseCode == HttpURLConnection.HTTP_OK) {
                            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                            String line;
                            StringBuilder response = new StringBuilder();
                            while ((line = reader.readLine()) != null) {
                                response.append(line);
                            }
                            reader.close();

                            // Feature 4: Temperature extraction
                            String temperature = parseTemperature(response.toString());

                            // Feature 3: Condition extraction
                            String condition = parseCondition(response.toString());

                            temperatureField.setText(temperature);
                            conditionLabel.setText(condition);
                        } else {
                            temperatureField.setText("Error");
                            conditionLabel.setText("");
                        }
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }
            }
        });

        add(locationLabel);
        add(locationField);
        add(fetchButton);
        add(temperatureLabel);
        add(temperatureField);
        add(conditionTextLabel);
        add(conditionLabel);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    // Feature 4: Temperature parsing
    private String parseTemperature(String json) {
        int startIndex = json.indexOf("\"temp\":") + 7;
        int endIndex = json.indexOf(",", startIndex);
        String temperature = json.substring(startIndex, endIndex);

        double kelvin = Double.parseDouble(temperature);
        double celsius = kelvin - 273.15;

        return String.format("%.2f °C", celsius);
    }

    // Feature 3: Condition parsing
    private String parseCondition(String json) {
        int startIndex = json.indexOf("\"main\":\"") + 8;
        int endIndex = json.indexOf("\"", startIndex);
        String condition = json.substring(startIndex, endIndex);

        return condition;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new WeatherApp();
            }
        });
    }
}