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CalorieTracker
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CalorieTracker
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import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
public class CalorieTracker extends JFrame {
private JTextField calorieField;
private JButton logButton;
private JTextArea calorieLogArea;
private static final String DATA_FILE = "calorie_log.txt";
public CalorieTracker() {
setTitle("Calorie Tracker");
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JPanel mainPanel = new JPanel(new BorderLayout());
calorieField = new JTextField(10);
mainPanel.add(calorieField, BorderLayout.NORTH);
logButton = new JButton("Log Calories");
logButton.addActionListener(new LogButtonListener());
mainPanel.add(logButton, BorderLayout.CENTER);
calorieLogArea = new JTextArea();
calorieLogArea.setEditable(false);
mainPanel.add(new JScrollPane(calorieLogArea), BorderLayout.SOUTH);
loadCalorieLog();
updateCalorieLogArea();
add(mainPanel);
setVisible(true);
}
private void loadCalorieLog() {
try (BufferedReader reader = new BufferedReader(new FileReader(DATA_FILE))) {
String line;
while ((line = reader.readLine()) != null) {
calorieLogArea.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(this, "Error loading calorie log: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
private void saveCalorieLog(String calorieEntry) {
try (BufferedWriter writer = new BufferedWriter(new FileWriter(DATA_FILE, true))) {
writer.write(calorieEntry);
writer.newLine();
} catch (IOException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(this, "Error saving calorie log: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
private void updateCalorieLogArea() {
calorieLogArea.setText("");
loadCalorieLog(); // Reloads the entire log to ensure it's up to date
}
private class LogButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String calorieStr = calorieField.getText().trim();
if (!calorieStr.isEmpty()) {
try {
int calorieInt = Integer.parseInt(calorieStr);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String currentDate = dateFormat.format(new Date());
String calorieEntry = currentDate + " - " + calorieInt + " calories";
saveCalorieLog(calorieEntry);
updateCalorieLogArea();
calorieField.setText("");
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(CalorieTracker.this, "Invalid calorie format", "Error", JOptionPane.ERROR_MESSAGE);
}
} else {
JOptionPane.showMessageDialog(CalorieTracker.this, "Please enter a calorie value", "Error", JOptionPane.ERROR_MESSAGE);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(CalorieTracker::new);
}
}