How to prompt a confirmation dialog box in the middle of non event dispatching thread

Question

I have the following fun which will be executed by non event dispatching thread. In the middle of thread, I want a

1. A confirmation box pop up. Thre

Answer 1

Launch the JOptionPane from the EDT, and pass the value back with a FutureTask.

public int fun()
{
    FutureTask dialogTask = new FutureTask(new Callable() 
    {
        @Override public Integer call() 
        {
            return JOptionPane.showConfirmDialog(SaveToCloudJDialog.this, message, title, JOptionPane.YES_NO_OPTION);
        }
    });
    SwingUtilities.invokeLater(dialogTask);
    int choice  = dialogTask.get();
}

Credit to jtahlborn How to pass results from EDT back to a different thread?