erro em codigo para animação em java

ola to tentando fazer uma animação em java e peguei esse codigo mas o botão que deveria iniciar a animação da indicando erro poderia me diser o que esta errado?

main(P1.getGraphics());
// TODO add your handling code here:
}

public class Stars3D extends JApplet {
public void init() {

 Demo demo = new Demo();
 getContentPane().add(demo);
 getContentPane().add("North", new DemoControls(demo));
 }
 class Demo extends JPanel {
 private Color colors[] = { Color.red, Color.green, Color.white };
 private AffineTransform at = AffineTransform.getTranslateInstance(-5, -5);
 private Shape shape, tshape;
 private Shape ribbon;
 public int fontSize = 100;
 public String text = "J2D";
 public int numStars = 300;
 public Demo() {
 setBackground(Color.black);
 }
 public void drawDemo(int w, int h, Graphics2D g2) {
 Rectangle2D rect = new Rectangle2D.Double();
 for (int i = 0; i < numStars; i++) {
 g2.setColor(colors[i%3]);
 g2.setComposite(AlphaComposite.getInstance(
 AlphaComposite.SRC_OVER, (float) Math.random()));
 rect.setRect(w*Math.random(), h*Math.random(),2,2);
 g2.fill(rect);
 }
 FontRenderContext frc = g2.getFontRenderContext();
 Font font = new Font("serif.bolditalic", Font.PLAIN, fontSize);
 shape = font.createGlyphVector(frc, text).getOutline();
 tshape = at.createTransformedShape(shape);
 PathIterator pi = shape.getPathIterator(null);
 float seg[] = new float[6];
 float tseg[] = new float[6];
 GeneralPath working = new GeneralPath(GeneralPath.WIND_NON_ZERO);
 float x=0, y=0; // Current point on the path
 float tx=0, ty=0; // Transformed path point
 float cx=0, cy=0; // Last moveTo point, for SEG_CLOSE
 float tcx=0, tcy=0; // Transformed last moveTo point

 while(!pi.isDone()) {
 int segType = pi.currentSegment(seg);
 switch(segType) {
 case PathIterator.SEG_MOVETO:
 at.transform(seg, 0, tseg, 0, 1);
 x = seg[0];
 y = seg[1];
 tx = tseg[0];
 ty = tseg[1];
 cx = x;
 cy = y;
 tcx = tx;
 tcy = ty;
 break;
 case PathIterator.SEG_LINETO:
 at.transform(seg, 0, tseg, 0, 1);
 if (Line2D.relativeCCW(x, y, tx, ty,
 seg[0], seg[1]) < 0) {
 working.moveTo(x, y);
 working.lineTo(seg[0], seg[1]);
 working.lineTo(tseg[0], tseg[1]);
 working.lineTo(tx, ty);
 working.lineTo(x, y);
 } else {
 working.moveTo(x, y);
 working.lineTo(tx, ty);
 working.lineTo(tseg[0], tseg[1]);
 working.lineTo(seg[0], seg[1]);
 working.lineTo(x, y);
 }

 x = seg[0];
 y = seg[1];
 tx = tseg[0];
 ty = tseg[1];
 break;

 case PathIterator.SEG_QUADTO:
 at.transform(seg, 0, tseg, 0, 2);
 if (Line2D.relativeCCW(x, y, tx, ty,
 seg[2], seg[3]) < 0) {
 working.moveTo(x, y);
 working.quadTo(seg[0], seg[1],
 seg[2], seg[3]);
 working.lineTo(tseg[2], tseg[3]);
 working.quadTo(tseg[0], tseg[1],
 tx, ty);
 working.lineTo(x, y);
 } else {
 working.moveTo(x, y);
 working.lineTo(tx, ty);
 working.quadTo(tseg[0], tseg[1],
 tseg[2], tseg[3]);
 working.lineTo(seg[2], seg[3]);
 working.quadTo(seg[0], seg[1],
 x, y);
 }

 x = seg[2];
 y = seg[3];
 tx = tseg[2];
 ty = tseg[3];
 break;

 case PathIterator.SEG_CUBICTO:
 at.transform(seg, 0, tseg, 0, 3);
 if (Line2D.relativeCCW(x, y, tx, ty,
 seg[4], seg[5]) < 0) {
 working.moveTo(x, y);
 working.curveTo(seg[0], seg[1],
 seg[2], seg[3],
 seg[4], seg[5]);
 working.lineTo(tseg[4], tseg[5]);
 working.curveTo(tseg[2], tseg[3],
 tseg[0], tseg[1],
 tx, ty);
 working.lineTo(x, y);
 } else {
 working.moveTo(x, y);
 working.lineTo(tx, ty);
 working.curveTo(tseg[0], tseg[1],
 tseg[2], tseg[3],
 tseg[4], tseg[5]);
 working.lineTo(seg[4], seg[5]);
 working.curveTo(seg[2], seg[3],
 seg[0], seg[1],
 x, y);
 }

 x = seg[4];
 y = seg[5];
 tx = tseg[4];
 ty = tseg[5];
 break;

 case PathIterator.SEG_CLOSE:
 if (Line2D.relativeCCW(x, y, tx, ty,
 cx, cy) < 0) {
 working.moveTo(x, y);
 working.lineTo(cx, cy);
 working.lineTo(tcx, tcy);
 working.lineTo(tx, ty);
 working.lineTo(x, y);
 } else {
 working.moveTo(x, y);
 working.lineTo(tx, ty);
 working.lineTo(tcx, tcy);
 working.lineTo(cx, cy);
 working.lineTo(x, y);
 }
 x = cx;
 y = cy;
 tx = tcx;
 ty = tcy;
 }
 pi.next();
 } // while
 ribbon = working;

 g2.setComposite(AlphaComposite.SrcOver);
 Rectangle r = shape.getBounds();
 g2.translate(w*.5-r.width*.5,h*.5+r.height*.5);

 g2.setColor(Color.blue);
 g2.fill(tshape);
 g2.setColor(new Color(255, 255, 255, 200));
 g2.fill(ribbon);

 g2.setColor(Color.white);
 g2.fill(shape);

 g2.setColor(Color.blue);
 g2.draw(shape);
 }

 public void paint(Graphics g) {
 Graphics2D g2 = (Graphics2D) g;
 Dimension d = getSize();
 g2.setBackground(getBackground());
 g2.clearRect(0, 0, d.width, d.height);
 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 RenderingHints.VALUE_ANTIALIAS_ON);
 drawDemo(d.width, d.height, g2);
 }
 } // End Demo class
 class DemoControls extends JPanel implements ActionListener {
 Demo demo;
 JTextField tf1, tf2;
 public DemoControls(Demo demo) {
 this.demo = demo;
 setBackground(Color.gray);
 JLabel l = new JLabel(" Text:");
 l.setForeground(Color.black);
 add(l);
 add(tf1 = new JTextField(demo.text));
 tf1.setPreferredSize(new Dimension(60,20));
 tf1.addActionListener(this);
 l = new JLabel(" Size:");
 l.setForeground(Color.black);
 add(l);
 add(tf2 = new JTextField(String.valueOf(demo.fontSize)));
 tf2.setPreferredSize(new Dimension(30,20));
 tf2.addActionListener(this);
 }

 public void actionPerformed(ActionEvent e) {
 try {
 if (e.getSource().equals(tf1)) {
 demo.text = tf1.getText().trim();
 } else if (e.getSource().equals(tf2)) {
 demo.fontSize = Integer.parseInt(tf2.getText().trim());
 if (demo.fontSize < 10) {
 demo.fontSize = 10;
 }
 }
 demo.repaint();
 } catch (Exception ex) {}
 }
 } // End DemoControls class
 public void main(String argv[]) {
 final Stars3D demo = new Stars3D();
 demo.init();
 JFrame f = new JFrame("Java 2D(TM) Demo - Stars3D");
 f.addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent e) {System.exit(0);}
 });
 f.getContentPane().add("Center", demo);
 f.pack();
 f.setSize(new Dimension(400,300));
 f.show();
 }
}