Program Java membuat jam

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package clock2d;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.Calendar;
import javax.swing.*;

/**
 *
 * @author Retno */
public class Main extends JApplet {
    public static void main(String s[]){
        JFrame frame=new JFrame();
        frame.setTitle("Clook");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JApplet applet=new Main();
        applet.init();
        frame.getContentPane().add(applet);
        frame.setVisible(true);
    }
    @Override
    public void init(){
        JPanel panel=new ClookPanel();
        getContentPane().add(panel);
    }
}
class ClookPanel extends JPanel implements ActionListener{
    AffineTransform rotH=new AffineTransform();
    AffineTransform rotM=new AffineTransform();
    AffineTransform rotS=new AffineTransform();

    public ClookPanel(){
        setPreferredSize(new Dimension(640, 480));
        setBackground(Color.white);
        Timer timer=new Timer(500, this);
        timer.start();
    }

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2=(Graphics2D)g;
        g2.translate(320, 240);

        //clock face
        Paint paint=new GradientPaint(-150, -150, Color.white, 150, 150, Color.gray);
        g2.setPaint(paint);
        g2.fillOval(-190, -190, 380, 380);
        g2.setColor(Color.gray);
        g2.drawString("Java 2D", -20, 80);
        Stroke stroke=new BasicStroke(3);
        g2.setStroke(stroke);
        g2.drawOval(-190, -190, 380, 380);
        for(int i=0; i<12; i++){
            g2.rotate(2*Math.PI/12);
        }

        //clock hands
        Shape hour=new Line2D.Double(0, 0, 0, -80);
        hour=rotH.createTransformedShape(hour);
        Shape minute=new Line2D.Double(0, 0, 0, -120);
        minute=rotM.createTransformedShape(minute);
        Shape second=new Line2D.Double(0, 0, 0, -120);
        second=rotS.createTransformedShape(second);
        g2.draw(hour);
        g2.draw(minute);
        g2.setStroke(new BasicStroke(2));
        g2.draw(second);
    }

    public void actionPerformed(ActionEvent e){
        int hour=Calendar.getInstance().get(Calendar.HOUR);
        int min=Calendar.getInstance().get(Calendar.MINUTE);
        int sec=Calendar.getInstance().get(Calendar.SECOND);
        rotH.setToRotation(Math.PI*(hour+min/60.0)/6.0);
        rotM.setToRotation(Math.PI*min/30.0);
        rotS.setToRotation(Math.PI*sec/30.0);
        repaint();
    }
}