About swing Timer and synchronized

Hello,
I would like your comment about synchronized and
SwingUtilities.invokeLater in this example with javax.swing.Timer:

/*
* First
*/
import java.awt.event.*;
import javax.swing.*;

public class MyTimer{

private Timer timer;

public MyTimer(){
initTimer();
}

public void startTimer(){
timer.start();
}

public static void main(String[] args) {
MyTimer myTimer = new MyTimer();
myTimer.startTimer();
JOptionPane.showMessageDialog( null, "Wait...","MyTimer" ,
JOptionPane.WARNING_MESSAGE);
}

private void initTimer(){
timer = new Timer( 5000, new ActionListener()
{
public void actionPerformed( ActionEvent e )
{
doAction();
}
} );
}

private void doAction(){
System.out.println("Hello!");
}
}

///////////////////////////////////////////////////////////////////////
/*
* Second
*/
.....

public static void main(String[] args) {
MyTimer myTimer = new MyTimer();
myTimer.startTimer();
JOptionPane.showMessageDialog( null, "Wait...","MyTimer" ,
JOptionPane.WARNING_MESSAGE);
}
......
private synchronized void doAction(){
System.out.println("Hello!");
}

/////////////////////////////////////////////////////////////
/*
* Third
*/

.......

public static void main(String[] args) {
MyTimer myTimer = new MyTimer();
myTimer.startTimer();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog( null, "Wait...","MyTimer" ,
JOptionPane.WARNING_MESSAGE);
}
});

}

........

private void doAction(){
System.out.println("Hello!");
}

//////////////////////////////////////////////////////////////
/*
* Fourth
*/

.......

public static void main(String[] args) {
MyTimer myTimer = new MyTimer();
myTimer.startTimer();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog( null, "Wait...","MyTimer" ,
JOptionPane.WARNING_MESSAGE);
}
});

}

........

private synchronized void doAction(){
System.out.println("Hello!");
}


Thanks,
Paolo
.

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