Java Swing - 如何獲取所有者窗口和根

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import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Window;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.plaf.basic.BasicComboPopup;
public class Main extends JPanel  {
  private JComboBox comboBox;
  public Main() {
    comboBox = new JComboBox(new String[] { "Select Pet", "Bird", "Cat", "Dog", "Rabbit",
        "Pig", "Other" });
    add(comboBox, BorderLayout.PAGE_START);
    JFrame frame = new JFrame("Main");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(comboBox);
    frame.pack();
    frame.setVisible(true);
    comboBox.showPopup();
    Object child = comboBox.getAccessibleContext().getAccessibleChild(0);
    BasicComboPopup popup = (BasicComboPopup) child;
    popup.setName("BasicComboPopup");
    JList list = popup.getList();
    Container c = SwingUtilities.getAncestorOfClass(JScrollPane.class, list);
 
 
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