用java写圆盘钟表的图形化界面

以下是一个简单的圆盘钟表的Java图形化界面的示例代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.time.LocalTime;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Clock extends JPanel implements ActionListener {
    private static final long serialVersionUID = 1L;

    private static final int WIDTH = 400;
    private static final int HEIGHT = 400;
    private static final int MARGIN = 20;
    private static final int RADIUS = (WIDTH - 2 * MARGIN) / 2;
    private static final Point CENTER = new Point(WIDTH / 2, HEIGHT / 2);
    private static final int TICK_LENGTH = 10;
    private static final int HOUR_HAND_LENGTH = RADIUS / 2;
    private static final int MINUTE_HAND_LENGTH = (int) (RADIUS * 0.8);
    private static final int SECOND_HAND_LENGTH = (int) (RADIUS * 0.9);

    private static final Font FONT = new Font("Arial", Font.PLAIN, 14);

    private Timer timer;

    public Clock() {
        timer = new Timer(1000, this);
        timer.start();

        setPreferredSize(new java.awt.Dimension(WIDTH, HEIGHT));
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        repaint();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        drawTicks(g2);
        drawNumbers(g2);
        drawHands(g2);
    }

    private void drawTicks(Graphics2D g2) {
        g2.setColor(Color.BLACK);
        for (int i = 0; i < 60; i++) {
            int tickLength = i % 5 == 0 ? 2 * TICK_LENGTH : TICK_LENGTH;
            double angle = Math.PI * i / 30;
            int x1 = (int) (CENTER.x + (RADIUS - tickLength) * Math.sin(angle));
            int y1 = (int) (CENTER.y - (RADIUS - tickLength) * Math.cos(angle));
            int x2 = (int) (CENTER.x + RADIUS * Math.sin(angle));
            int y2 = (int) (CENTER.y - RADIUS * Math.cos(angle));
            g2.drawLine(x1, y1, x2, y2);
        }
    }

    private void drawNumbers(Graphics2D g2) {
        g2.setFont(FONT);
        g2.setColor(Color.BLACK);
        for (int i = 1; i <= 12; i++) {
            double angle = Math.PI * (i - 3) / 6;
            int x = (int) (CENTER.x + (RADIUS - 2 * TICK_LENGTH) * Math.sin(angle));
            int y = (int) (CENTER.y - (RADIUS - 2 * TICK_LENGTH) * Math.cos(angle));
            g2.drawString(Integer.toString(i), x, y);
        }
    }

    private void drawHands(Graphics2D g2) {
        LocalTime now = LocalTime.now();
        int hour = now.getHour() % 12;
        int minute = now.getMinute();
        int second = now.getSecond();

        double hourAngle = Math.PI * (hour - 3) / 6 + Math.PI * minute / 360;
        int hourX = (int) (CENTER.x + HOUR_HAND_LENGTH * Math.sin(hourAngle));
        int hourY = (int) (CENTER.y - HOUR_HAND_LENGTH * Math.cos(hourAngle));
        g2.setColor(Color.BLACK);
        g2.drawLine(CENTER.x, CENTER.y, hourX, hourY);

        double minuteAngle = Math.PI * (minute - 15) / 30;
        int minuteX = (int) (CENTER.x + MINUTE_HAND_LENGTH * Math.sin(minuteAngle));
        int minuteY = (int) (CENTER.y - MINUTE_HAND_LENGTH * Math.cos(minuteAngle));
        g2.setColor(Color.BLUE);
        g2.drawLine(CENTER.x, CENTER.y, minuteX, minuteY);

        double secondAngle = Math.PI * (second - 15) / 30;
        int secondX = (int) (CENTER.x + SECOND_HAND_LENGTH * Math.sin(secondAngle));
        int secondY = (int) (CENTER.y - SECOND_HAND_LENGTH * Math.cos(secondAngle));
        g2.setColor(Color.RED);
        g2.drawLine(CENTER.x, CENTER.y, secondX, secondY);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Clock");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(new Clock(), BorderLayout.CENTER);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

在这个示例中，我们使用Java Swing构建了一个圆盘钟表，它包含一个时针、分针和秒针，以及刻度线和数字。我们使用了Java的时间库来获取当前的时间，并根据当前时间计算时针、分针和秒针的角度。我们使用了Java的绘图库来绘制钟表的图形，并使用定时器来实现每秒钟更新一次钟表的显示。