Problem with actionperformed callback

I tried to create function, what shows textdialog, when client press the buton, but the problem is that i have defined frame under public static void main and in ActionPerformed callback first parameter "frame" is undefined. How could i fix this?

import java.awt.*;































































































































































































































































































































































































































































































































import java.awt.event.*;































































































































































































































































































































































































































































































































import java.applet.Applet;































































































































































































































































































































































































































































































































import javax.swing.*;

public class Vestlus extends Applet implements ActionListener {































































































































































































































































































































































































































































































































TextField tf = new TextField("");































































































































































































































































































































































































































































































































Button nupp = new Button(" Sisesta ");

public Vestlus()































































































































































































































































































































































































































































































































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add(tf);































































































































































































































































































































































































































































































































add(nupp);































































































































































































































































































































































































































































































































nupp.addActionListener(this);

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public void actionPerformed(ActionEvent e)































































































































































































































































































































































































































































































































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if(e.getSource() == nupp)































































































































































































































































































































































































































































































































{































































































































































































































































































































































































































































































































JOptionPane.showMessageDialog(frame,"Hoiatus","Vää rtused ei klapi!", JOptionPane.INFORMATION_MESSAGE);

}































































































































































































































































































































































































































































































































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public static void main(String args[])































































































































































































































































































































































































































































































































{

JFrame frame = new JFrame("Project LA");































































































































































































































































































































































































































































































































frame.add(new Vestlus());































































































































































































































































































































































































































































































































frame.setSize(300,200);































































































































































































































































































































































































































































































































frame.setVisible(true);































































































































































































































































































































































































































































































































frame.setDefaultCloseOperation(1);

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}