How to disable my Jbutton before a long operation?

Question

I want to disable a button before sending email and enable it once it is finished, I know it is something to do with Swing thread, but I cant get it work, someone please help me...
The button can be disabled if i commented out sendEmail(...), sendEmail() is just function to send email using JavaMail API to send email to multiple recipients, so i guess the JavaMail uses thread for its process? How can I disable the button before sending emails?
          sendButton.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                         SwingUtilities.invokeLater(new Runnable() {
                              public void run() {
                                   sendButton.setText("Please wait...");
                                   sendButton.setEnabled(false);
                         /* some logic */
                         sendEmail();
                         sendButton.setEnabled(true);
                         sendButton.setText("Send Email");
          });

Answer 1

Kevin Workman wrote:
Kayaman wrote:
Kevin Workman wrote:
Kayaman wrote:
Use invokeAndWait().Why? He's in actionPerformed, so he's already on the EDT. Why use invokeAndAnything?Oh so now I'm expected to read the posts fully before answering.
I knew this move to Oracle would result in devastation.Hahaha. Where's the "like" button when you need it?Oh, please.
As if we need ANOTHER 'Like' button on the internet, with the 124131234621466123461^42 (approximately) that are out there at the moment >:(