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JOptionPane.showMessageDialog(null, "hi \n", "Dialog Title", JOptionPane.ERROR_MESSAGE);

String date = JOptionPane.showInputDialog(null, "hi", "hi", JOptionPane.QUESTION_MESSAGE);

int response = JOptionPane.showConfirmDialog(null, "Dialog Message");

if (response == JOptionPane.YES_OPTION)
   //perform yes action

else if (response == JOptionPane.NO_OPTION)
    //perform yes action