用Java写一个日历加钟表要带图形界面

好的，我可以给你提供一个简单的Java代码示例，使用Swing库来实现一个日历和时钟的图形界面。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
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.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

public class CalendarClock extends JFrame {

    private static final long serialVersionUID = 1L;

    private JPanel calendarPanel;
    private JPanel clockPanel;

    private JLabel dateLabel;
    private JLabel timeLabel;

    private SimpleDateFormat dateFormat;
    private SimpleDateFormat timeFormat;

    public CalendarClock() {
        super("Calendar and Clock");

        // Set up date and time formats
        dateFormat = new SimpleDateFormat("EEE, MMM d, yyyy");
        timeFormat = new SimpleDateFormat("h:mm:ss a");

        // Create calendar panel
        calendarPanel = new JPanel(new GridLayout(7, 7));
        calendarPanel.setBackground(Color.WHITE);

        // Add day labels
        String[] daysOfWeek = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
        for (int i = 0; i < daysOfWeek.length; i++) {
            JLabel label = new JLabel(daysOfWeek[i], JLabel.CENTER);
            label.setFont(new Font("SansSerif", Font.BOLD, 14));
            calendarPanel.add(label);
        }

        // Add calendar days
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, 1);
        int firstDayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
        int daysInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        int dayOfMonth = 1 - firstDayOfWeek + 1;
        for (int i = 0; i < 7 * 6; i++) {
            if (i < firstDayOfWeek - 1 || dayOfMonth > daysInMonth) {
                calendarPanel.add(new JLabel(""));
            } else {
                JLabel label = new JLabel("" + dayOfMonth, JLabel.CENTER);
                label.setFont(new Font("SansSerif", Font.PLAIN, 14));
                calendarPanel.add(label);
                dayOfMonth++;
            }
        }

        // Create clock panel
        clockPanel = new JPanel(new BorderLayout());
        clockPanel.setBackground(Color.WHITE);

        // Add date label
        dateLabel = new JLabel(dateFormat.format(new Date()), JLabel.CENTER);
        dateLabel.setFont(new Font("SansSerif", Font.BOLD, 18));
        clockPanel.add(dateLabel, BorderLayout.NORTH);

        // Add time label
        timeLabel = new JLabel(timeFormat.format(new Date()), JLabel.CENTER);
        timeLabel.setFont(new Font("SansSerif", Font.BOLD, 24));
        clockPanel.add(timeLabel, BorderLayout.CENTER);

        // Create timer to update time label
        Timer timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                timeLabel.setText(timeFormat.format(new Date()));
            }
        });
        timer.start();

        // Add panels to frame
        add(calendarPanel, BorderLayout.WEST);
        add(clockPanel, BorderLayout.CENTER);

        // Set frame size and visibility
        setSize(600, 400);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

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

}

这个程序会在左侧显示一个日历，右侧显示一个时钟，并且会每秒更新一次当前时间。你可以根据自己的需求对代码进行修改和定制。