Java Swing How to - JTabbedPane: change tab size when change tab title

Question

We would like to know how to jTabbedPane: change tab size when change tab title.
Answer

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import java.util.Random;
/*from   ww w .j  av a  2 s .c o  m*/
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.Timer;

public class Main extends JPanel {
  static Random random = new Random();
  static String format = "00000000";
  static DecimalFormat df = new DecimalFormat(format);
  static JTabbedPane tabbedPane = new JTabbedPane();
  Timer timer;
  JLabel odometer = new JLabel(df.format(0));
  int km;

  public Main() {
    setPreferredSize(new Dimension(320, 240));
    add(odometer);
    JComboBox colorBox = new JComboBox(new String[]{"a","b"});
    colorBox.addActionListener(e->{
        tabbedPane.setTitleAt(tabbedPane.getSelectedIndex(),
            "my full new title");
    });
    this.add(colorBox);
    timer = new Timer(250, new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        km += random.nextInt(100);
        odometer.setText(df.format(km));
      }
    });
    timer.start();
  }

  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    tabbedPane.add("Cab #1", new Main());
    tabbedPane.add("Cab #2", new Main());
    tabbedPane.add("Cab #3", new Main());
    f.add(tabbedPane);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}