Paint() method in awt??

Question

whats the diffrence between these two codes??
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
import java.awt.geom.*;
public class NotHelloWorldPanel extends Frame
     public void paint(Graphics g)
          g.drawRect(10,10,100,100);
     public NotHelloWorldPanel()
          setSize(300,300);
          setVisible(true);
     public static void main(String args[])
          NotHelloWorldPanel n1= new NotHelloWorldPanel();
and
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
import java.awt.geom.*;
public class NotHelloWorldPanel
     public void paint(Graphics g)
          g.drawRect(10,10,100,100);
     public NotHelloWorldPanel()
          Frame f1 = new Frame();
          f1.setSize(300,300);
          f1.setVisible(true);
     public static void main(String args[])
          NotHelloWorldPanel n1= new NotHelloWorldPanel();
one of them seems to work!! not both??

Answer 1

First off, use code tags when posting code. You'll find the button for them next to the quote button.
As for your semi-readable code, why do you expect the second class to draw anything on the frame? You never told it to do so. All you did was implement a paint(Graphics) method that will never be called.