java万年历图形化界面

要实现Java万年历的图形化界面，你可以使用Swing或JavaFX等GUI工具包。以下是一个简单的Java万年历图形化界面的实现示例：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class CalendarGUI extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JLabel timeLabel;
    private JPanel calendarPanel;

    public CalendarGUI() {
        super("Java万年历");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        timeLabel = new JLabel();
        timeLabel.setHorizontalAlignment(JLabel.CENTER);
        timeLabel.setBorder(BorderFactory.createLineBorder(Color.BLACK));

        calendarPanel = new JPanel(new GridLayout(7, 7));
        calendarPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));

        String[] daysOfWeek = {"日", "一", "二", "三", "四", "五", "六"};
        for (String day : daysOfWeek) {
            calendarPanel.add(new JLabel(day, JLabel.CENTER));
        }

        refreshCalendar(Calendar.getInstance().getTime());

        add(timeLabel, BorderLayout.NORTH);
        add(calendarPanel, BorderLayout.CENTER);

        setVisible(true);
    }

    public void refreshCalendar(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.DATE, 1);

        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH) + 1;

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月");
        timeLabel.setText(sdf.format(date));

        calendarPanel.removeAll();

        String[] daysOfWeek = {"日", "一", "二", "三", "四", "五", "六"};
        for (String day : daysOfWeek) {
            calendarPanel.add(new JLabel(day, JLabel.CENTER));
        }

        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
        for (int i = 0; i < dayOfWeek; i++) {
            calendarPanel.add(new JLabel(""));
        }

        int daysOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int i = 1; i <= daysOfMonth; i++) {
            JButton button = new JButton(String.valueOf(i));
            button.addActionListener(this);
            calendarPanel.add(button);
        }

        int remainingDays = 42 - daysOfMonth - dayOfWeek;
        for (int i = 0; i < remainingDays; i++) {
            calendarPanel.add(new JLabel(""));
        }

        validate();
    }

    public static void main(String[] args) {
        new CalendarGUI();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        JButton button = (JButton) e.getSource();
        int day = Integer.parseInt(button.getText());
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, day);
        refreshCalendar(calendar.getTime());
    }
}

这个示例程序使用了Swing工具包来实现Java万年历的图形化界面。程序中的`refreshCalendar()`方法负责根据给定的日期更新日历面板的内容。在程序中，我们使用了JButton、JLabel和JPanel等组件来实现日历面板。我们还为每个按钮添加了动作监听器，以便在用户单击某个日期时更新日历面板。