Java Swing How to - Tell if the tab that is the active tab in JTabbedPane

Question

We would like to know how to tell if the tab that is the active tab in JTabbedPane.

Answer

import java.awt.Dimension;
//from   w w w .  ja v  a2  s .  c o m
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTabbedPane;
import javax.swing.SwingConstants;

public class Main {
  public static void main(String[] args) {
    JTabbedPane tabbedPane = new JTabbedPane();
    for (int i = 0; i < 5; i++) {
      tabbedPane.add("Tab " + i,
          new JLabel("Label " + i, SwingConstants.CENTER));
    }

    tabbedPane.getModel().addChangeListener(e-> {
        JLabel label = (JLabel) tabbedPane.getSelectedComponent();
        System.out.println(label.getText());
    });

    tabbedPane.setPreferredSize(new Dimension(500, 300));

    JFrame frame = new JFrame();
    frame.getContentPane().add(tabbedPane);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}