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Display question message dialog with JOptionPane QUESTION_MESSAGE

import javax.swing.JOptionPane; import javax.swing.JPanel; public class JOptionPaneQUESTION_MESSAGE {   public static void main(String[] args) {     final JPanel panel = new JPanel();     JOptionPane.showMessageDialog(panel, "Are you sure to quit?", "Question",         JOptionPane.QUESTION_MESSAGE);   } }