Java Swing - 如何将图像图标添加到JTabbedPane标题选项卡...

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;

public class Main extends JFrame implements ActionListener {
  JTabbedPane tabbedPane;
  JButton focusButton;
  JPanel contentPane, tab1 = new JPanel(), tab2 = new JPanel();
  JTextField textField1 = new JTextField(10), textField2 = new JTextField(10), textField3 = new JTextField(10);

  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    textField1.requestFocusInWindow();
    tab1.add(textField1);

    tab2.add(textField2);
    tab2.add(textField3);

    contentPane = new JPanel();
    contentPane.setLayout(new BorderLayout());

    tabbedPane = new JTabbedPane(JTabbedPane.TOP, JTabbedPane.WRAP_TAB_LAYOUT);
    tabbedPane.addTab("TAB 1", null, tab1, "I am TAB 1");
    tabbedPane.addTab("TAB 2", null, tab2, "I am TAB 2");

    focusButton = new JButton("CHANGE FOCUS");
    getRootPane().setDefaultButton(focusButton);
    focusButton.addActionListener(this);

    contentPane.add(tabbedPane, BorderLayout.CENTER);
    contentPane.add(focusButton, BorderLayout.PAGE_END);
    setContentPane(contentPane);
    pack();
    setVisible(true);
  }

  public void actionPerformed(ActionEvent ae) {
    if (tabbedPane.getSelectedIndex() == 0) {
      tabbedPane.setSelectedIndex(1);
      textField3.requestFocusInWindow();
    } else if (tabbedPane.getSelectedIndex() == 1) {
      tabbedPane.setSelectedIndex(0);
      textField1.requestFocusInWindow();
    }
  }
  public static void main(String... args) {
    new Main();
  }
}