How to use actionListers within static methods

Ian Wilson <>
Fri, 12 May 2006 16:11:22 +0100
In the code below I am attempting to define an ActionListener for a
button so I can do something useful when the button is pressed.

At the statement
     ButtonListener buttonListener = new ButtonListener();
Eclipse says "No enclosing instance of type Hats is accessible, Must
qualify the allocation with an enclosing instance of type Hats (e.g. A() where x is an instance of Hats".

The trouble is I never intend to instantiate Hats since I don't ever
expect to need multiple Hats objects in existence at the same time.

Q.1 Is there a fix?

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class StaticGUI {
   public static JFrame frame = new JFrame();
   public static void main(String[] args) {
     // main GUI with menu that invokes ...

class Hats {
   // so can refer to addButton in buttonListener:
   public static JButton addButton;

   public static void editHats() {
     addButton = new JButton("Add");
     JButton editButton = new JButton("Edit");
     JButton removeButton = new JButton("Remove");
     ButtonListener buttonListener = new ButtonListener();
     JPanel buttonPanel = new JPanel();
     JPanel panel = new JPanel();
     panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
     JTextArea textArea = new JTextArea();
     JOptionPane pane = new JOptionPane(
         panel, // "message"
         JOptionPane.PLAIN_MESSAGE, // messagetype
         JOptionPane.OK_CANCEL_OPTION // optiontype
     JDialog dialog = pane.createDialog(StaticGUI.frame,"Test");
   } // method editHats

   // an inner class within Hats, to listen to Hat-related button events
   class ButtonListener implements ActionListener {
     public void actionPerformed(ActionEvent e) {
       JComponent c = (JComponent) e.getSource();
       if (c == addButton) {
         System.out.println ("You pressed 'Add'");
} // class Hats

Q.2 should I rethink my whole approach to my design of this application?

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