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Java Swing - 如何強(qiáng)制JOptionPane保持打開

我們想知道如何強(qiáng)制JOptionPane保持打開。 
import javax.swing.JComboBox;
import javax.swing.JOptionPane;

public class Main {

  public static void main(String[] args) {
    Object[] options = { "Option 1", "Option 2", "Option 3",
        "None of the above" };
    JComboBox optionControl = new JComboBox(options);
    optionControl.setSelectedIndex(3);
    JOptionPane.showMessageDialog(null, optionControl, "Option",
        JOptionPane.QUESTION_MESSAGE);
    System.out.println(optionControl.getSelectedItem());

    String graphSelection = (String) JOptionPane.showInputDialog(null,
        "Choose from the following options...", "Choose From DropDown",
        JOptionPane.QUESTION_MESSAGE, null, options,
        options[3]); 
    System.out.println(graphSelection);

    JOptionPane.showMessageDialog(null, optionControl, "Option",
        JOptionPane.QUESTION_MESSAGE);
  }
}