基于jdk8和swing图形写一个万年历

好的，我可以为你提供一个简单的万年历的实现。首先是界面的代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

public class CalendarFrame extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private String[] weekDays = { "日", "一", "二", "三", "四", "五", "六" };
    private JButton lastMonth, nextMonth;
    private JLabel title;
    private JPanel calendarPanel;
    private int year, month, day;

    public CalendarFrame() {
        super("万年历");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        JPanel topPanel = new JPanel(new FlowLayout());
        lastMonth = new JButton("上个月");
        nextMonth = new JButton("下个月");
        lastMonth.addActionListener(this);
        nextMonth.addActionListener(this);
        title = new JLabel("", SwingConstants.CENTER);
        topPanel.add(lastMonth);
        topPanel.add(title);
        topPanel.add(nextMonth);
        contentPane.add(topPanel, BorderLayout.NORTH);
        calendarPanel = new JPanel(new GridLayout(7, 7));
        calendarPanel.setPreferredSize(new Dimension(300, 200));
        contentPane.add(calendarPanel, BorderLayout.CENTER);
        // 获取当前日期
        Calendar now = Calendar.getInstance();
        year = now.get(Calendar.YEAR);
        month = now.get(Calendar.MONTH) + 1;
        day = now.get(Calendar.DAY_OF_MONTH);
        updateCalendar(year, month);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

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

    private void updateCalendar(int year, int month) {
        // 清空面板上的所有组件
        calendarPanel.removeAll();
        // 设置标题
        title.setText(year + "年" + month + "月");
        // 设置字体
        Font font = new Font("宋体", Font.PLAIN, 14);
        // 添加星期标签
        for (int i = 0; i < weekDays.length; i++) {
            JLabel label = new JLabel(weekDays[i], SwingConstants.CENTER);
            label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            label.setFont(font);
            calendarPanel.add(label);
        }
        // 获取当月第一天的星期
        Calendar cal = Calendar.getInstance();
        cal.set(year, month - 1, 1);
        int weekDay = cal.get(Calendar.DAY_OF_WEEK) - 1;
        // 添加前面的空白格子
        for (int i = 0; i < weekDay; i++) {
            calendarPanel.add(new JLabel(""));
        }
        // 添加日期格子
        int maxDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int i = 1; i <= maxDay; i++) {
            JButton button = new JButton(String.valueOf(i));
            button.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            button.setFont(font);
            button.addActionListener(this);
            // 标记当前日期
            if (year == this.year && month == this.month && i == day) {
                button.setBackground(Color.YELLOW);
            }
            calendarPanel.add(button);
        }
        // 重绘面板
        calendarPanel.validate();
        calendarPanel.repaint();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        int y = year, m = month;
        if (e.getSource() == lastMonth) {
            if (month == 1) {
                y--;
                m = 12;
            } else {
                m--;
            }
        } else if (e.getSource() == nextMonth) {
            if (month == 12) {
                y++;
                m = 1;
            } else {
                m++;
            }
        } else {
            JButton button = (JButton) e.getSource();
            int d = Integer.parseInt(button.getText());
            y = year;
            m = month;
            day = d;
        }
        updateCalendar(y, m);
    }
}

这个程序使用了Swing图形库，可以在JDK8中编译运行。主要实现了以下功能：

1. 显示当前日期的万年历。
2. 点击上个月或下个月按钮可以切换月份。
3. 点击日期按钮可以直接跳转到对应的日期。
4. 标记当前日期，方便查看。

界面比较简单，使用了GridLayout布局来排列日期格子。updateCalendar方法根据年份和月份生成日期格子，并将它们添加到面板上。使用了Calendar类来获取当前日期和计算每个月的天数。actionPerformed方法监听按钮点击事件，根据点击的按钮来切换月份或跳转日期。

希望这个简单的实现能够帮助你完成你的需求。