import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.geom.*;
public class Tanks extends JApplet
{
 public static final int WIDTH  = 400;
 public static final int HEIGHT = 400;
 private JButton button1;
 private PaintSurface currentSurface = new PaintSurface();
 public Tanks()
 { 
  this.add(currentSurface,BorderLayout.CENTER);
  ButtonListener b1 = new ButtonListener();
  JPanel panel = new JPanel();
  panel.setBackground(Color.white);
 currentSurface.setBackground(Color.white);
  button1 = new JButton("Start");
  button1.addActionListener(b1);
  panel.add(button1);
  this.add(panel,BorderLayout.NORTH);
 }
 
 public void init()
 {
  this.setSize(WIDTH, HEIGHT);
  this.setVisible(true);
 
 }
 
 private class ButtonListener implements ActionListener
 {
 
  public void actionPerformed(ActionEvent e)
  {
   if(e.getActionCommand() == "Start")
   {
    currentSurface.figure="Start";
    repaint();
   }
  }
 
 }
}
 
class AnimationThread extends Thread
{
 JApplet c;
 public AnimationThread(JApplet c)
 {
  this.c = c;
 }
 public void run()
 {
 }
}
 
class PaintSurface extends JComponent
{
 String figure;
 
 public PaintSurface()
 {
 }
 public void paint(Graphics g)
 {
  Graphics2D g2 = (Graphics2D)g;
  g2.setRenderingHint(
   RenderingHints.KEY_ANTIALIASING,
   RenderingHints.VALUE_ANTIALIAS_ON);
 
  if(figure=="Start")
  {
   Shape s = new Ellipse2D.Float(20,50,250,150);
   g2.setPaint(Color.BLACK);
   g2.draw(s);
  }
 
 }
}