java textfield problem

I want to navigate the content of text field from one class to another and viceversa through button but when I am getting the text from first class I am getting null value.please help me..here is the code

import javax.swing.*;

import java.awt.event.*;

class Frame1 extends JFrame

{

private JButton btn1;

private JTextField tf1;

public Frame1()

{

setLayout(null);

setSize(500,500);

tf1=new JTextField();

tf1.setBounds(100,100,100,30);

btn1=new JButton("click for second frame");

btn1.setBounds(100,250,100,30);

btn1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

        {

            String text=tf1.getText();

            new Frame2(text);

        }

    });
add(tf1);

add(btn1);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

}

public JTextField getTextField1()

{
    return tf1;
}

} class Frame2 extends JFrame {

private JButton btn2;

private JTextField tf2;

private String secondtext;

public Frame2()

{



}

public Frame2(String firsttext)

{

    setLayout(null);

    setSize(500,500);

    tf2=new JTextField();

    tf2.setText(firsttext);

    secondtext=tf2.getText();

    tf2.setBounds(100,100,100,30);

    btn2=new JButton("click for first frame");

    btn2.setBounds(100,250,100,30);

    btn2.addActionListener(new MyActionListener());
    add(tf2);
    add(btn2);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
}
public JTextField getTextField2()
{

    return tf2;
}
public String getText()
{

    return secondtext;

}

} class MyActionListener extends Frame1 implements ActionListener {

private String text;

private JTextField tf1;

private JTextField tf2;

private Frame2 frame2;

public MyActionListener()

{



    super();

    frame2=new Frame2();

    text=frame2.getText();

    modify();

}

public void actionPerformed(ActionEvent e)

{

    new MyActionListener();

}

public void modify()

{
    tf1=super.getTextField1();
    tf2=frame2.getTextField2();
    tf1.setText(text);
}

}

class MyFrame
{

public static void main(String args[])

{

    new Frame1();

}

}