Java Swing - 如何检查X按钮在JOptionPane中的表示方式

import javax.swing.JOptionPane;

public class Main {
  public static void main(String[] args) {
    int result = JOptionPane.showConfirmDialog(null, "This is a test", "Test",
        JOptionPane.YES_NO_OPTION);

    System.out.println("result: " + result);

    switch (result) {
    case JOptionPane.YES_OPTION:
      System.out.println("Yes Pressed");
      break;
    case JOptionPane.NO_OPTION:
      System.out.println("No Pressed");
      break;
    case JOptionPane.CLOSED_OPTION:
      System.out.println("Dialog closed");
      break;
    default:
      System.out.println("Default");
      break;
    }
  }
}