Bulb Test 2

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

class bulb implements ActionListener
{
   boolean on;
   Color C;
   int x, y;
   int radius = 25;
   String name;

   public bulb()
   {
      C = Color.blue;
      on = true;
      x = 100;
      y = 100;
      name = "bulb";
   }

   public bulb(String name, int x, int y, Color C)
   {
      this.C = C;
      this.x = x;
      this.y = y;
      this.name = name;
      on = true;
   }


   public void draw(Graphics g)
   {
      if (on) g.setColor( C );
      else g.setColor(C.darker().darker());
      g.fillOval(x-radius,y-radius,2*radius,2*radius);
   }

   public void change_state()
   {
      on = !on;
   }

   public String toString()
   {
      return "bulb " + name + "  " + on;
   }

   public void actionPerformed(ActionEvent e)
   {
      on = !on;
      System.out.println(this);
   }
}



public class BulbTest2 extends JPanel implements ActionListener 
{
   static final int N = 4;
   JButton[] b = new JButton[N];
   bulb[] bulbs = new bulb[N];
   JPanel lower;
   String[] names = { "one", "two", "three", "four", "five", "six", "seven" };
   Color[] colors = { Color.yellow, Color.green, Color.blue, 
      Color.red, Color.magenta, Color.orange, Color.pink };

   public BulbTest2()
   {
     setPreferredSize(new Dimension(20+65*N,60));
     lower = new JPanel(new FlowLayout());
      for (int i=0; i<N; i++) {
	bulbs[i] = new bulb(names[i],30+65*i,30,colors[i]);
	b[i] = new JButton(names[i]);
	b[i].addActionListener(bulbs[i]);
	b[i].addActionListener(this);
	lower.add(b[i]);
      }
 
        
   }

   public void paintComponent(Graphics g)
   {
      super.paintComponent(g);
      for (int i=0; i<N; i++) bulbs[i].draw(g);

      }

    public static void main(String[] args)
    {
      BulbTest2 panel = new BulbTest2();
      JFrame app = new JFrame("Bulb Test 2");        
      app.getContentPane().add(panel);
      app.getContentPane().add(panel.lower,BorderLayout.SOUTH);
      app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      app.pack();
      app.setVisible(true);
    }    
    
    public void actionPerformed(ActionEvent e)
    {
       repaint();        
    }    
}