multiple frame

Hi i want to do something that sounds simple but it has been giving me a lot of problems. I want to display two panels inside of a jframe. So far none of the panels show up when i run the program. I can't figure out why at least one of them isn't showing up. here's the code thanks

Code:

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import java.awt.*;
import java.awt.BorderLayout.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class twoFrame extends JFrame
{

        private JFrame big;
        private JPanel panel1, panel2;
        private JButton but;
        private JScrollPane sp;
        private JTextArea full;

        public twoFrame()
        {
                JFrame big = new JFrame();


                full = new JTextArea();

                sp = new JScrollPane(full);
                sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
                sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
                full.setEditable(false);



                JPanel panel1 = new JPanel();
                getContentPane().add(panel1);
                panel1.setPreferredSize(new Dimension (300,300));
                panel1.setLayout(null);
                //panel1.setBounds(10,10,300,300);
                panel1.setVisible(true);

                add(panel1);
                panel1.add(sp);


                JPanel panel2 = new JPanel();
                getContentPane().add(panel2);
                panel2.setLayout(null);


                big.add(panel1);
                big.add(panel2);
                //panel2.add(but);
                //big.add(but);
                pack();

                setTitle("Practice Frame");
                setLocationRelativeTo(null);
                setDefaultCloseOperation(EXIT_ON_CLOSE);
                setVisible(true);
                this.setExtendedState(Frame.MAXIMIZED_BOTH);
        }
        public static void main(String[] args)
        {
                twoFrame tf = new twoFrame();
        }

}

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