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

public class Clock extends JFrame {
	public Clock() {
		ClockPaint cp = new ClockPaint(20, 20, 70);

		this.add(cp);
		this.setSize(200, 200);
		this.setResizable(false);
		this.setLocation(260, 120);
		this.setTitle("小時鐘");
		this.setVisible(true);
	}

	public static void main(String[] s) {
		new Clock();
	}
}

class ClockPaint extends JPanel implements Runnable {
	int x, y, r;

	int h, m, s;// 小時，分鐘，秒

	double rad = Math.PI / 180;

	public ClockPaint(int x, int y, int r) {
		this.x = x;
		this.y = y;
		this.r = r;
		Calendar now = new GregorianCalendar();
		s = now.get(Calendar.SECOND) * 6;// 獲得秒轉(zhuǎn)換成度數(shù)
		m = now.get(Calendar.MINUTE) * 6;// 獲得分鐘
		h = (now.get(Calendar.HOUR_OF_DAY) - 12) * 30
				+ now.get(Calendar.MINUTE) / 12 * 6;// 獲得小時

		Thread t = new Thread(this);
		t.start();
	}

	public void paint(Graphics g) {
		// 清屏
		super.paint(g);
		g.setColor(Color.BLACK);
		g.fillRect(0, 0, r * 3, r * 3);
		// 畫圓
		g.setColor(Color.WHITE);
		g.drawOval(x, y, r * 2, r * 2);
		// 秒針
		g.setColor(Color.RED);
		int x1 = (int) ((r - 10) * Math.sin(rad * s));
		int y1 = (int) ((r - 10) * Math.cos(rad * s));
		g.drawLine(x + r, y + r, x + r + x1, y + r - y1);
		// 分針
		g.setColor(Color.BLUE);
		x1 = (int) ((r - r / 2.5) * Math.sin(rad * m));
		y1 = (int) ((r - r / 2.5) * Math.cos(rad * m));
		g.drawLine(x + r, y + r, x + r + x1, y + r - y1);
		// 時針
		g.setColor(Color.CYAN);
		x1 = (int) ((r - r / 1.5) * Math.sin(rad * h));
		y1 = (int) ((r - r / 1.5) * Math.cos(rad * h));
		g.drawLine(x + r, y + r, x + r + x1, y + r - y1);
		// 數(shù)字
		g.setColor(Color.YELLOW);
		int d = 29;
		for (int i = 1; i <= 12; i++) {
			x1 = (int) ((r - 10) * Math.sin(rad * d));
			y1 = (int) ((r - 10) * Math.cos(rad * d));
			g.drawString(i + "", x + r + x1 - 4, x + r - y1 + 5);
			d += 30;
		}
		// 小點
		d = 0;
		for (int i = 0; i < 60; i++) {
			x1 = (int) ((r - 2) * Math.sin(rad * d));
			y1 = (int) ((r - 2) * Math.cos(rad * d));
			g.drawString(".", x + r + x1 - 1, x + r - y1 + 1);
			d += 6;
		}
		// 顯示時間
		Calendar now1 = new GregorianCalendar();
		g.drawString(now1.get(Calendar.HOUR_OF_DAY) + "："
				+ now1.get(Calendar.MINUTE) + "：" + now1.get(Calendar.SECOND),
				0, 10);

	}

	public void run() {
		while (true) {
			try {
				this.repaint();
				Thread.sleep(1000);
			} catch (Exception ex) {
			}
			s += 6;
			if (s >= 360) {
				s = 0;
				m += 6;
				if (m == 72 || m == 144 || m == 216 || m == 288) {
					h += 6;
				}
				if (m >= 360) {
					m = 0;
					h += 6;
				}
				if (h >= 360) {
					h = 0;
				}
			}
			
		}
	}
}