How do I show and hide a popup message by the program

Hi,
I've the following problem. Sometime the program must wait to open a seriel port. On slow machines, this could take some seconds.
During this time I'll display a popup message with the message "please, be patient....".
After the port is open, the message should be hide by the program.
JOptionPane could be good, but without a "OK" button. Everthing should be controlled by the program.
I would implement the Runnable interface for the showing of the popup message.
Any ideas? Thanks in advance.
Hans

You can use a JDialog... this will act like JOptionPane, but you can put on it whatever components you like... so no OK button!
For example:
JDialog dialog = new JDialog(parentFrame);
dialog.add(new JLabel("Please be patient", BorderLayout.CENTER);
dialog.pack();
dialog.setLocation(100,100);
dialog.setVisible(true);
dialog.setVisible(false);

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