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SimpleCalendar
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SimpleCalendar
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import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.*;
public class SimpleCalendar extends JFrame {
private Calendar currentCalendar;
private JLabel monthLabel;
private JButton previousMonthButton;
private JButton nextMonthButton;
private JPanel calendarPanel;
private JTextArea eventTextArea;
private JTextField eventField;
private JButton addEventButton;
private Map<Date, String> eventsMap;
public SimpleCalendar() {
setTitle("Simple Calendar");
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JPanel mainPanel = new JPanel(new BorderLayout());
JPanel headerPanel = new JPanel(new FlowLayout());
monthLabel = new JLabel();
headerPanel.add(monthLabel);
previousMonthButton = new JButton("Previous");
previousMonthButton.addActionListener(new PreviousMonthButtonListener());
headerPanel.add(previousMonthButton);
nextMonthButton = new JButton("Next");
nextMonthButton.addActionListener(new NextMonthButtonListener());
headerPanel.add(nextMonthButton);
mainPanel.add(headerPanel, BorderLayout.NORTH);
calendarPanel = new JPanel(new GridLayout(0, 7));
mainPanel.add(calendarPanel, BorderLayout.CENTER);
JPanel eventPanel = new JPanel(new BorderLayout());
eventTextArea = new JTextArea(10, 20);
eventTextArea.setEditable(false);
eventPanel.add(new JScrollPane(eventTextArea), BorderLayout.CENTER);
JPanel eventInputPanel = new JPanel(new FlowLayout());
eventField = new JTextField(15);
eventInputPanel.add(eventField);
addEventButton = new JButton("Add Event");
addEventButton.addActionListener(new AddEventButtonListener());
eventInputPanel.add(addEventButton);
eventPanel.add(eventInputPanel, BorderLayout.SOUTH);
mainPanel.add(eventPanel, BorderLayout.EAST);
currentCalendar = Calendar.getInstance();
updateCalendar();
eventsMap = new HashMap<>();
add(mainPanel);
setVisible(true);
}
private void updateCalendar() {
calendarPanel.removeAll();
currentCalendar.set(Calendar.DAY_OF_MONTH, 1);
int month = currentCalendar.get(Calendar.MONTH);
int year = currentCalendar.get(Calendar.YEAR);
monthLabel.setText(new SimpleDateFormat("MMMM yyyy").format(currentCalendar.getTime()));
Calendar calendar = (Calendar) currentCalendar.clone();
calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
for (int i = 0; i < 7; i++) {
JLabel label = new JLabel(new SimpleDateFormat("EE").format(calendar.getTime()), SwingConstants.CENTER);
calendarPanel.add(label);
calendar.add(Calendar.DAY_OF_MONTH, 1);
}
while (calendar.get(Calendar.MONTH) == month) {
int day = calendar.get(Calendar.DAY_OF_MONTH);
JButton button = new JButton(String.valueOf(day));
button.addActionListener(new DayButtonListener(day));
calendarPanel.add(button);
calendar.add(Calendar.DAY_OF_MONTH, 1);
}
calendarPanel.revalidate();
calendarPanel.repaint();
}
private void updateEventTextArea() {
eventTextArea.setText("");
Date currentDate = currentCalendar.getTime();
if (eventsMap.containsKey(currentDate)) {
eventTextArea.setText(eventsMap.get(currentDate));
}
}
private class PreviousMonthButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
currentCalendar.add(Calendar.MONTH, -1);
updateCalendar();
updateEventTextArea();
}
}
private class NextMonthButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
currentCalendar.add(Calendar.MONTH, 1);
updateCalendar();
updateEventTextArea();
}
}
private class DayButtonListener implements ActionListener {
private int day;
public DayButtonListener(int day) {
this.day = day;
}
@Override
public void actionPerformed(ActionEvent e) {
currentCalendar.set(Calendar.DAY_OF_MONTH, day);
updateEventTextArea();
}
}
private class AddEventButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String event = eventField.getText().trim();
if (!event.isEmpty()) {
eventsMap.put(currentCalendar.getTime(), event);
updateEventTextArea();
eventField.setText("");
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(SimpleCalendar::new);
}
}