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

class DrawRectAndCir extends JPanel{
    public void paint( Graphics g ) {
g.drawOval (50, 10, 220, 220);
g.drawOval (70, 30, 180, 180);
g.drawOval (90, 50, 140, 140);
g.drawOval (110, 70, 100, 100);
g.drawOval (130, 90, 60, 60);
g.drawRect (150, 110, 20, 20);

g.drawRect (300, 10, 300, 220);
g.drawRect (320, 30, 260, 180);
g.drawRect (340, 50, 220, 140);
g.drawRect (360, 70, 180, 100);
g.drawRect (380, 90, 140, 60);
g.drawOval (400, 110, 100, 20);

   }
}

public class DrawConcentricRectangleAndCircles extends JPanel {

  public void paint(Graphics g) {
g.drawOval (50, 10, 220, 220);
g.drawOval (70, 30, 180, 180);
g.drawOval (90, 50, 140, 140);
g.drawOval (110, 70, 100, 100);
g.drawOval (130, 90, 60, 60);
g.drawOval (150, 110, 20, 20);

g.drawRect (300, 10, 300, 220);
g.drawRect (320, 30, 260, 180);
g.drawRect (340, 50, 220, 140);
g.drawRect (360, 70, 180, 100);
g.drawRect (380, 90, 140, 60);
g.drawRect (400, 110, 100, 20);
  }


  public static void main(String s[]) {
  final JFrame frame = new JFrame("Show Triangle");
  final JPanel p = new DrawConcentricRectangleAndCircles();
  final JPanel p1=new DrawRectAndCir();
  JButton b=new JButton("Convert");
  b.setSize(100,20);
  b.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e){
         p.setVisible(false);
         frame.getContentPane().add("Center", p1);
          p1.setVisible(true);
      }
  });
  p1.setVisible(false);
  frame.getContentPane().add("Center", p);
   frame.getContentPane().add("South", b);

  frame.setSize(650,320);
  frame.show();
  }
}