Java Swing - 如何handle JTabbedPane的Tab切換事件

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import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
public class Main extends JFrame {
  private void init() {
    this.setLayout(new BorderLayout());
    JPanel topPanel = new JPanel();
    final JLabel topLabel = new JLabel("North");
    topPanel.add(topLabel);
    this.add(topPanel, BorderLayout.NORTH);
    JTabbedPane tabbedPane = new JTabbedPane();
    JPanel firstTabCont = new JPanel();
    firstTabCont.add(new JLabel("First"));
    tabbedPane.addTab("First", firstTabCont);
    JPanel secondTabCont = new JPanel();
    secondTabCont.add(new JLabel("Second"));
    tabbedPane.addTab("Second", secondTabCont);
    this.add(tabbedPane, BorderLayout.CENTER);
    JPanel bottomPanel = new JPanel();
    final JLabel bottomLabel = new JLabel("South");
    bottomPanel.add(bottomLabel);
    this.add(bottomPanel, BorderLayout.SOUTH);
    tabbedPane.addChangeListener(evt -> {
 
 
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