plzzzzzzzzz xplain this code 

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

public class Link extends Frame implements ActionListener
{
	Label l1;
	Button b1;

     public static void main(String sr[])
          {

              new Link().setVisible(true);

          }

     public Link()
          {
            super("Warning");
            setSize(500,500);
            setBackground(Color.lightGray);
            setLayout(null);


          l1=new Label("There is no Link");
          l1.setBounds(0,0,500,460);
          l1.setFont(new Font("TimesRoman",Font.BOLD,35));
	      l1.setAlignment(Label.CENTER);
          add(l1);

          b1=new Button("QUIT");
          b1.setBackground(Color.orange);
          b1.setBounds(0,460,500,40);
          b1.addActionListener(this);
          add(b1);

          }


      public void actionPerformed(ActionEvent e)

          {
               this.dispose();
	      }

}