Re: How to use actionListers within static methods

From:
Thomas Fritsch <i.dont.like.spam@invalid.com>
Newsgroups:
comp.lang.java.gui
Date:
Fri, 12 May 2006 16:17:42 GMT
Message-ID:
<newscache$ilu5zi$t68$1@news.ops.de>
Vova Reznik wrote:

Ian Wilson wrote:

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.
x.new A() where x is an instance of Hats".

Q.1 Is there a fix?


Yes, define class Hats as static

You probably meant:
   Yes, define class ButtonListener as static

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();

[...]

  } // method editHats

  // an inner class within Hats, to listen to Hat-related button events
  class ButtonListener implements ActionListener {

static 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


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