Java tutorial
import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTabbedPane; public class Main { public static void main(String[] args) { JPanel ui = new JPanel(new BorderLayout(1, 1)); JTabbedPane jtp = new JTabbedPane(JTabbedPane.LEFT); jtp.addTab("Apple", new JLabel("Apple")); jtp.addTab("Banana", new JLabel("Banana")); jtp.addTab("Cherries", new JLabel("Cherries")); jtp.addTab("Grapes", new JLabel("Grapes")); ui.add(jtp, BorderLayout.CENTER); jtp.setPreferredSize(new Dimension(200, 200)); jtp.addChangeListener(e -> { if (e.getSource() instanceof JTabbedPane) { JTabbedPane pane = (JTabbedPane) e.getSource(); System.out.println("Selected paneNo : " + pane.getSelectedIndex()); } }); } }