import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class CanvasTable3 extends Applet implements ActionListener {

Button b;
Panel labelPanel;
int labels;
int count;
Font f;

public void init() 
{
	f = new Font("SansSerif", Font.BOLD, 15);
	b = new Button("Refresh");
	add(b);
	b.addActionListener(this);
	labels = 200;
	labelPanel = new Panel();
	labelPanel.setLayout(new GridLayout(labels/20, 20, 4, 4));
	labelPanel.setBackground(Color.green);
	addElements();
	add(labelPanel);
}

final void addElements()
{
	LabelCanvas[] myLabel = new LabelCanvas[labels];
	Color color = ((count%2 == 0)? Color.orange : Color.yellow);
	count++;
	for (int i=0; i<labels; i++)
	{
		myLabel[i] = new LabelCanvas(String.valueOf(i), f);
		myLabel[i].setBackground(color);
		labelPanel.add(myLabel[i]);
	}
}

public void actionPerformed(ActionEvent ae)
{
	if (ae.getSource() == b) 
	{
		labelPanel.removeAll();
		addElements();
		validate();
	}
}
}  // END OF Class CanvasTable3



class LabelCanvas extends Canvas  {	
									
Font f;
String label;

LabelCanvas(String label, Font f)
{
	this.label = label;
	this.f = f;
}

public final void paint(Graphics g)
{
	g.setFont(f);
	g.drawString(label, 0, 25);
}	

public final Dimension getMinimumSize()
{
	return (new Dimension(30, 30));
}

public final Dimension getPreferredSize()
{
	return(getMinimumSize());
}
}  // END OF Class LabelCanvas