I have a JOptionPane with a string and a text field as the "message" part.
It works but I would like input focus to default to the text field when the
dialog is displayed to save the user having to click into it each time.  How
can I achieve this?  Do I need to actually create a JOptionPane explicitly
or subclass it?

The code is as follows:

JTextField nameTextField = new JTextField();
Object[] message = {"Enter a name:", nameTextField};
int option = JOptionPane.showOptionDialog(null, message, "Enter Name",
JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null, null, null);