Re: A nested class and the fields of her enclosing class

Mark Space <>
Thu, 04 Jun 2009 08:18:41 -0700
Mark Space wrote:

GIampiero Mughini wrote:

And I see every time on my console first "is not Empty" then "is Empty"
after clicking on the button of my GUI :-/

You example looks like it should work. I'll give it a try. However,

Here's my example I wrote from your code. Mine works. Does it give you
any clues?

package fubar;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.InvocationTargetException;
import java.util.Hashtable;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFrame;

public class EdtTest extends JFrame {
     JButton viewButtion = new JButton("click me");
     EdtTest() {
         add( viewButtion );
         setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
         setSize(200, 200);
     public static void main(String[] args) {
         Hashtable h = new Hashtable();
         h.put("red", "fish");
         h.put("blue", "fish");
         new Upload().startUpload(h);

     public JButton getViewButtion() {
         return viewButtion;


class Upload {

     private Hashtable<String, Long> filesTable;
     private JButton button;

     protected void startUpload(Hashtable<String, Long> myFilesTable ) {

         this.filesTable = myFilesTable;
         if (!filesTable.isEmpty()) {
             System.out.println("is not Empty");
         startNewWindow(); //opens the GUI
         button.addActionListener(new MyActionListener());


     void startNewWindow(){
         try {
             javax.swing.SwingUtilities.invokeAndWait(new Runnable() {

                 public void run() {
         } catch (InterruptedException ex) {
null, ex);
         } catch (InvocationTargetException ex) {
null, ex);

     private void createAndShowGui() {
         EdtTest edtTest = new EdtTest();
         button = edtTest.getViewButtion();

// start nested class
     public class MyActionListener implements ActionListener {

         public void actionPerformed(ActionEvent arg0) {
             if (filesTable.isEmpty()) {
                 System.out.println("is Empty");
             } else {
                 System.out.println("files = " + filesTable );
     }; //end nested class

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