Get the index of the tab by matching the child component in JTabbedPane in Java

  // w w w  . j a va2 s.  c  o  m
import java.awt.BorderLayout;

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

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Tabbed Pane Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JTabbedPane tabbedPane = new JTabbedPane();
    
    JButton button = new JButton("a");
    
    
    tabbedPane.addTab("java2s.com", new JButton("a"));
    tabbedPane.addTab("java2s.com", button);

    int index = tabbedPane.indexOfComponent(button);

    System.out.println(index);

    frame.add(tabbedPane, BorderLayout.CENTER);
    frame.setSize(400, 150);
    frame.setVisible(true);
  }
}