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Java Swing - 如何焦点JOptionPane从组合框ItemEvent调用时

joptionpane 【joptionpane】
我们想知道如何焦点JOptionPane从组合框ItemEvent调用时。
代码展示 运行结果 
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.WindowConstants;

public class Main extends JFrame {

   JComboBox jComboBox1;
   boolean boloComboBox = false;

  public Main() {
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    jComboBox1 = new JComboBox();
    jComboBox1.setModel(new DefaultComboBoxModel(new String[] { "1", "2" }));
    jComboBox1.addItemListener(evt -> {
      if (jComboBox1.isPopupVisible()) {
        jComboBox1.setPopupVisible(false);
        fireTask(evt);
      }
    });
    add(jComboBox1);
    pack();
  }

  private void fireTask(java.awt.event.ItemEvent evt) {
    if (evt.getStateChange() == 2) {
      int i = JOptionPane.showConfirmDialog(jComboBox1, "Message Text",
          "Title", JOptionPane.OK_CANCEL_OPTION);
      System.out.println("Result:" + i);
    }
  }

  public static void main(String args[]) {
    new Main().setVisible(true);
  }
}