Purpose of JDialog#setModal

Question

What is the purpose of d.setModal(true);?

public DatePicker(JFrame parent) {
    dialog = new JDialog();
    dialog.setModal(true);

    String[] header = { "Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat" };

    JPanel panel = new JPanel(new GridLayout(7, 7));
    panel.setPreferredSize(new Dimension(430, 120));

    ...
}

I have tried to search here, on StackOverflow, but did not find any convincing answer.

Answer 1

It's a good idea to check the main documentation: setModal

modal - specifies whether dialog blocks input to other windows when shown;

Also note that

This method is obsolete and is kept for backwards compatibility only. Use setModalityType() instead.

Then check the Dialog.ModalityType to see what your options are.