Re: How to use actionListers within static methods

Vova Reznik <>
Fri, 12 May 2006 15:41:11 GMT
Ian Wilson wrote:

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?

Yes, define class Hats as static

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?

Yes, put Hats into another .java file

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