How to add image to a table cell...?

public class picIO extends Component{

	BufferedImage ig;
	public void paint(Graphics p)
	{
		p.drawImage(ig, 0, 0,this);
	}	
	public Dimension getPreferredSize()
	{
		if(ig==null)
		{
			return new Dimension(30,40);
		}
		else
		{
			return new Dimension(ig.getWidth(),ig.getHeight());
		}
	}
	public picIO(String file)
	{
		try
		{
			File f=new File(file);
			ig=ImageIO.read(f);
			
		}
		catch(IOException e)
		{
		}
		
	}
}
and also a class that extends DefaultTableModel
in it wrote...
public class getColumnClass(int col)
{
      if(d[col]=="image")
          return picIO.class;
}
problem that arose:-
when I gave the file name in the cell of the table
output is the classname itself i.e. picIO@79v345
this 79v345 is the random number of the file that i chose
what can be done to make visible the image