Swing JFC Java

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  4. 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);
  }
}