graphics.drawImage(new ImageIcon("/home/leyer/h.jpg").getImage(), 0,0, getWidth(), getHeight(), null);

public class JTextFiel extends javax.swing.JTextField{
	private static final long serialVersionUID = 1L;
 
	private static int instancias;
 
	  public JTextFiel(){
	     instancias++;
	  }
	  public static int getInstances(){
	    return instancias;
	  }
	  public static void main(String args[]){
		 new JTextFiel();
		 new JTextFiel();
		 new JTextFiel();
		 System.out.println(JTextFiel.getInstances());
	  }
	}