Java Swing - 如何句柄JTabbedPane选项卡使用ChangeListener更改事件

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

public class Main {

  public static void main(String[] args) {
    JPanel ui = new JPanel(new BorderLayout(1, 1));
    JTabbedPane jtp = new JTabbedPane(JTabbedPane.LEFT);
    jtp.addTab("Apple", new JLabel("Apple"));
    jtp.addTab("Banana", new JLabel("Banana"));
    jtp.addTab("Cherries", new JLabel("Cherries"));
    jtp.addTab("Grapes", new JLabel("Grapes"));
    ui.add(jtp, BorderLayout.CENTER);
    jtp.setPreferredSize(new Dimension(200, 200));
    jtp.addChangeListener(e -> {
      if (e.getSource() instanceof JTabbedPane) {
        JTabbedPane pane = (JTabbedPane) e.getSource();
        System.out.println("Selected paneNo : " + pane.getSelectedIndex());
      }
    });
  }
}