希望每天叫醒你的不是鬧鐘而是夢想！

Java代碼實現：

package woxiang.test;

import java.awt.*;
import java.util.Date;
import javax.swing.*;

public class Clock extends JComponent {

    private static final long serialVersionUID = -5379472973578609775L;
    private Font f = new Font("微軟雅黑", Font.PLAIN, 15);
    private Font f2 = new Font("微軟雅黑", Font.BOLD, 15);
    private JLabel l = new JLabel("當前時間：");
    private JLabel display = new JLabel();
    private JLabel display2 = new JLabel("");
    private int hour = 0;
    private int min = 0;
    private int sec = 0;
    private Date now = new Date();
    private Graphics2D g;
    final double PI = Math.PI;
    private String strTime = "";

    @SuppressWarnings("deprecation")
    public Clock() {
        add(l);
        l.setBounds(120, 320, 80, 20);
        l.setFont(f);
        add(display);
        display.setBounds(195, 320, 80, 20);
        display.setFont(f);
        display.setBorder(BorderFactory.createLineBorder(Color.black));
        add(display2);
        display2.setBounds(90, 350, 250, 20);
        display2.setFont(f);
        hour = now.getHours();
        min = now.getMinutes();
        sec = now.getSeconds();
        setVisible(true);
    }

    public void paintComponent(Graphics g1) {
        double x, y;
        super.paintComponent(g1);
        g = (Graphics2D) g1;
        //反鋸齒開關開
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        //畫表盤
        g.setPaint(new GradientPaint(5, 40, Color.red, 15, 50, Color.yellow, true));
        g.setStroke(new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
        g.drawOval(75, 40, 250, 250);
        g.fillOval(195, 160, 10, 10);
        g.setColor(Color.black);

        //畫60個點
        for (int i = 0; i < 60; i++) {
            double[] co = new double[2];
            co = paint_Dot(i * 2 * PI / 60);
            x = co[0];
            y = co[1];
            if (i == 0 || i == 15 || i == 30 || i == 45)//畫3,6,9,12四個大點
            {
                g.fillOval((int) (x - 5 + 200), (int) (y - 5 + 165), 10, 10);
            } else//其他小點
            {
                g.fillOval((int) (x - 2.5 + 200), (int) (y - 2.5 + 165), 3, 3);
            }
        }

        //畫四個數字
        g.setFont(f2);
        g.drawString("3", 300, 171);
        g.drawString("6", 195, 273);
        g.drawString("9", 91, 171);
        g.drawString("12", 195, 68);  //g.drawString("12", 190, 68);

        //畫時針，分針，秒針
        paint_HourPointer(hour * 3600 + min * 60 + sec, g);//時針走過的秒數
        paint_MinutePointer(min * 60 + sec, g);//分針走過的秒數
        paint_SecondPointer(sec, g);//秒針走過的秒數
    }

    public void showUI() {
        new Thread() {
            @SuppressWarnings("deprecation")
            public void run() {
                while (true) {
                    now = new Date();
                    hour = now.getHours();
                    min = now.getMinutes();
                    sec = now.getSeconds();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                        ex.printStackTrace();
                    }
                    showTime();
                    repaint();
                }
            }
        }.start();
    }

    public void paint_HourPointer(int second, Graphics2D g) {//second表示當前時間的時針相對00:00:00走了多少秒
        double x, y, angle;
        angle = second * PI / 21600;//時針的速度爲PI/21600 (rad/s)
        x = 200 + 60 * Math.sin(angle);
        y = 165 - 60 * Math.cos(angle);
        g.setStroke(new BasicStroke(5, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND));
        g.setPaint(new GradientPaint(200, 165, Color.red, 260, 165, Color.blue, true));
        g.drawLine(200, 165, (int) x, (int) y);
    }

    public void paint_MinutePointer(int second, Graphics2D g) {//second表示當前時間的分針相對00:00:00走了多少秒
        double x, y, angle;
        angle = second * PI / 1800;//分針的速度爲PI/1800 (rad/s)
        x = 200 + 80 * Math.sin(angle);
        y = 165 - 80 * Math.cos(angle);
        g.setStroke(new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND));
        g.setPaint(new GradientPaint(200, 165, Color.magenta, 280, 165, Color.blue, true));
        g.drawLine(200, 165, (int) x, (int) y);
    }

    public void paint_SecondPointer(int second, Graphics2D g) {//second表示當前時間的秒針相對00:00:00走了多少秒
        double x, y, x1, y1, x2, y2, x3, y3, angle;
        double cos = 90 / Math.sqrt(8125);//90*90+5*5
        double sin = 5 / Math.sqrt(8125);
        angle = second * PI / 30;//時針的速度爲PI/30 (rad/s)
        x = 200 + 95 * Math.sin(angle);
        y = 165 - 95 * Math.cos(angle);
        x1 = 200 + 20 * Math.sin(angle + PI);
        y1 = 165 - 20 * Math.cos(angle + PI);
        x2 = 200 + Math.sqrt(8125) * (Math.sin(angle) * cos - Math.cos(angle) * sin); //sin(a-b)
        y2 = 165 - Math.sqrt(8125) * (Math.cos(angle) * cos + Math.sin(angle) * sin); //cos(a-b)
        x3 = 200 + Math.sqrt(8125) * (Math.sin(angle) * cos + Math.cos(angle) * sin); //sin(a+b)
        y3 = 165 - Math.sqrt(8125) * (Math.cos(angle) * cos - Math.sin(angle) * sin); //cos(a+b)
        g.setStroke(new BasicStroke(2, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
        g.setPaint(new GradientPaint(180, 165, Color.CYAN, 295, 165, Color.MAGENTA, true));
        g.drawLine((int) x1, (int) y1, (int) x, (int) y);
        g.drawLine((int) x2, (int) y2, (int) x, (int) y);
        g.drawLine((int) x3, (int) y3, (int) x, (int) y);
    }

    public double[] paint_Dot(double angle) {
        double[] co = new double[2];
        co[0] = 115 * Math.cos(angle);//橫座標
        co[1] = 115 * Math.sin(angle);//縱座標
        return co;
    }

    @SuppressWarnings("deprecation")
    private void showTime() {
        String date;
        int hour_temp = hour, min_temp = min, sec_temp = sec;
        sec_temp += 1;
        if (sec_temp >= 60) {
            sec_temp = 0;
            min_temp += 1;
        }
        if (min_temp >= 60) {
            min_temp = 0;
            hour_temp += 1;
        }
        if (hour_temp < 10)
            strTime = "0" + hour_temp + ":";
        else
            strTime = "" + hour_temp + ":";

        if (min_temp < 10)
            strTime = strTime + "0" + min_temp + ":";
        else
            strTime = strTime + "" + min_temp + ":";

        if (sec < 10)
            strTime = strTime + "0" + sec_temp;
        else
            strTime = strTime + "" + sec_temp;
        //在窗體上設置顯示時間
        date = " " + (now.getYear() + 1900) + "年" + (now.getMonth() + 1) + "月" + now.getDate() + "日   " + "星期";
        switch (now.getDay()) {
            case 1:
                date += "一";
                break;
            case 2:
                date += "二";
                break;
            case 3:
                date += "三";
                break;
            case 4:
                date += "四";
                break;
            case 5:
                date += "五";
                break;
            case 6:
                date += "六";
                break;
            case 7:
                date += "日";
                break;
        }
        date += "  CST";  //Chinese standard time
        strTime = "  " + strTime;
        display.setText(strTime);
        display2.setText(date);
    }

    public static void main(String args[]) {
        Clock c = new Clock();
        c.showUI();
        JFrame f = new JFrame("yunyaniu");
        Image img = Toolkit.getDefaultToolkit().getImage("image/logo小.jpg");//窗口圖標
        f.setIconImage(img);
        f.setSize(400, 420);
        f.setResizable(false);
        f.add(c, BorderLayout.CENTER);
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
}