import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
 
public class MySplatPanel extends JPanel
{
   private MyCircle circle1, circle2, circle3, circle4, circle5;
   private JButton button1;
		
   //-----------------------------------------------------------------
   //  Constructor: Sets up GUI-components and creates five Circle objects.
   //-----------------------------------------------------------------
   public MySplatPanel()
   {
      /*GUI*/
      button1 = new JButton("Touch me!");
      button1.addActionListener (new ButtonListener());
		
      /*add graphic componenents to panel*/
      add (button1);
		
		
      /*Circles*/
      circle1 = new MyCircle (30);
      circle2 = new MyCircle (50);
      circle3 = new MyCircle (100);
      circle4 = new MyCircle (45);
      circle5 = new MyCircle (60);
 
      setPreferredSize (new Dimension(300, 200));
      setBackground (Color.black);
 
	}
 
   //-----------------------------------------------------------------
   //  Draws this panel by requesting that each circle draw itself.
   //-----------------------------------------------------------------
   public void paintComponent (Graphics page)
   {
      super.paintComponent(page);
 
      circle1.draw(page);
      circle2.draw(page);
      circle3.draw(page);
      circle4.draw(page);
      circle5.draw(page);
		
   }
	
	private class ButtonListener implements ActionListener
	{		
	    public void actionPerformed (ActionEvent event)
	    {
	    circle1 = new MyCircle (30);
      	    circle2 = new MyCircle (50);
      	    circle3 = new MyCircle (100);
      	    circle4 = new MyCircle (45);
     	    circle5 = new MyCircle (60);
	    }	
		
	   //------------------------------
	   //If I add the following it won't compile
	   //-------------------------------
		
	   /*public void paintComponent (Graphics page)
   	   {
    	   super.paintComponent(page);

    	   circle1.draw(page);
     	   circle2.draw(page);
      	   circle3.draw(page);
            circle4.draw(page);
            circle5.draw(page);
	   }*/
    }
}
 

private Vector circles;
 
public MySplatPanel()
{
   //code
   circles = new Vector();
   circles.add(new MyCircle (30));
   circles.add(new MyCircle (50));
   circles.add(new MyCircle (100));
   circles.add(new MyCircle (45));
   circles.add(new MyCircle (60));
   //code
}
 
public void paintComponent (Graphics page)
{
   super.paintComponent(page);
   for(int n=0; n < circles.size(); n++)
   {
      ((MyCircle)circles.get(n)).draw(page);
   }		
}
 
public void actionPerformed (ActionEvent event)
{
   circles.add(new MyCircle (30));
   circles.add(new MyCircle (50));
   circles.add(new MyCircle (100));
   circles.add(new MyCircle (45));
   circles.add(new MyCircle (60));
}	

class SomeActionListener implements ActionListener{
    public void actionPerformed(ActionEvent evt){
        //   your operations...
        //   more of your operations....
        //   bored hence more operations
        updateUI();
    }
}