可设置Java awt时钟

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

class H2Clock extends JFrame {
public static Date d = new Date();
private static final long serialVersionUID = 1L;
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
TextField tf = new TextField(sdf.format(d), 8);

public H2Clock() {
this.setSize(400, 400);
this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().setBackground(Color.blue);
this.getContentPane().add(new Clock(), "Center");

tf.setBounds(0, 0, 50, 20);
tf.addKeyListener(new KeyListener() {
@SuppressWarnings("deprecation")
public void keyPressed(KeyEvent e) {
if (tf.getText().length() > 8) {
JOptionPane.showMessageDialog(null, "输入格式有误!");
tf.setText(tf.getText().substring(0, 8));
}
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
System.out.println(tf.getText());
try {
Date d0 = sdf.parse(tf.getText());
d.setHours(d0.getHours());
d.setMinutes(d0.getMinutes());
d.setSeconds(d0.getSeconds());
} catch (ParseException e1) {
JOptionPane.showMessageDialog(null, "输入格式有误!");
e1.printStackTrace();
}
}
}

@Override
public void keyTyped(KeyEvent e) {
}

@Override
public void keyReleased(KeyEvent e) {
}
});
this.getContentPane().add(tf, "North");
System.out.println(tf.getText());
this.setTitle("时钟演示");
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}

public static void main(String args[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
new H2Clock().setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

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

// Thread timer;
int oldh = -1, oldm = -1, olds = -1, hq = -1, mq = -1, sq = -1;
final double RAD = Math.PI / 180.0;

Thread th;

public Clock() {
super();
this.setOpaque(false); // 设置透明
new ActionListener() {
public void actionPerformed(ActionEvent evt) {
// repaint();

}
};
// new Timer(1000, taskPerformer).start();
th = new Thread(this);
th.start();

}

public void run() {
while (true) {
// System.out.println("HELLO");
repaint();

try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO: handle exception
}
}
}

@SuppressWarnings("deprecation")
public void paintComponent(Graphics g) {
int h, m, s, q, x1, y1, x2, y2;
int x0 = this.getWidth() / 2, y0 = this.getHeight() / 2;
int R = (x0 > y0 ? y0 : x0) - 30;

d.setSeconds(d.getSeconds() + 1);

h = d.getHours();
m = d.getMinutes();
s = d.getSeconds();
g.setColor(Color.LIGHT_GRAY);
g.fillOval(x0 - R, y0 - R, 2 * R, 2 * R); // 画表盘
g.setColor(Color.white);
g.drawOval(x0 - R + 3, y0 - R + 3, 2 * R - 7, 2 * R - 7); // 画刻度
for (int i = 0; i < 12; i++) {
y1 = (int) (y0 - Math.cos(i * 30 * RAD) * R * (float) 4 / 5);
x1 = (int) (x0 + Math.sin(i * 30 * RAD) * R * (float) 4 / 5);
y2 = (int) (y0 - Math.cos(i * 30 * RAD) * (R - 3));
x2 = (int) (x0 + Math.sin(i * 30 * RAD) * (R - 3));
g.drawLine(x1, y1, x2, y2);
}
q = h * 30 + m / 2; // 计算时针角度
drawHand(g, x0, y0, 10, R * 4 / 7, q, Color.blue); // 画时针
q = m * 6 + s / 10; // 计算分针角度
drawHand(g, x0, y0, 5, R * 2 / 3, q, Color.yellow); // 画分针
q = s * 6; // 计算秒针角度
drawHand(g, x0, y0, 2, R * 4 / 5, q, Color.red); // 画秒针
g.setColor(Color.black);
g.drawOval(x0 - 2, y0 - 2, 4, 4); // 画轴心
}

void drawHand(Graphics g, int x0, int y0, int w, int L, int q, Color c) {
int x[] = new int[4];
int y[] = new int[4];
x[0] = x0 - (int) (Math.sin(RAD * q) * L / 6);
y[0] = y0 + (int) (Math.cos(RAD * q) * L / 6);
x[1] = x0 + (int) (Math.sin(RAD * (90 - q)) * w);
y[1] = y0 + (int) (Math.cos(RAD * (90 - q)) * w);
x[2] = x0 + (int) (Math.sin(RAD * q) * L);
y[2] = y0 - (int) (Math.cos(RAD * q) * L);
x[3] = x0 - (int) (Math.sin(RAD * (90 - q)) * w);
y[3] = y0 - (int) (Math.cos(RAD * (90 - q)) * w);
g.setColor(c);
g.fillPolygon(x, y, 4);
}
}
}