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

public class CanvasTable extends Applet {

Button b;
Panel labelPanel;
int labels;

public void init() 
{
	b = new Button("Refresh");
	add(b);
	labels = 100;
	labelPanel = new Panel();
	labelPanel.setLayout(new GridLayout(labels/20, 20, 4, 4));
	add(labelPanel);
	addElements();
	validate();
}

final void addElements()
{
	LabelCanvas[] myLabel = new LabelCanvas[labels];
	for (int i=0; i<labels; i++)
	{
		myLabel[i] = new LabelCanvas(String.valueOf(i));
		myLabel[i].setBackground(Color.orange);
		labelPanel.add(myLabel[i]);
	}
}

public boolean action(Event evt, Object obj)
{
	if (evt.target == b) 
	{
		labelPanel.removeAll();
		addElements();
		validate();
	}
	return super.action(evt, obj);
}
}  // END OF Class CanvasTable



class LabelCanvas extends Canvas  {	
									
int height;
int width;
Font f;
String label;
boolean needToResetWidth;

LabelCanvas(String label)
{
	this.label = label;
	f = new Font("Helvetica", Font.BOLD, 15);
	height = 30;
	needToResetWidth = true;
}

final void setWidth(Graphics g)
{
	FontMetrics fm = g.getFontMetrics();
	width = fm.stringWidth(label);
	needToResetWidth = false;		
}

public void addNotify()
{
	super.addNotify();
	repaint();
}

public final void paint(Graphics g)
{
	g.setFont(f);
	if (needToResetWidth) setWidth(g);
	g.drawString(label, 0, height - 5);
}	

public final Dimension minimumSize()
{
	if (needToResetWidth)
	{
		Graphics g = getGraphics();
		setWidth(g);
		g.dispose();
	}
	return (new Dimension(width, height));
}

public final Dimension preferredSize()
{
	return(minimumSize());
}

public final void update(Graphics g)
{
	paint(g);
}
}  // END OF Class LabelCanvas