import javax.swing.*;
import java.awt.BorderLayout;
import javax.swing.event.*;

public class JTabbedPaneTest14 extends JFrame implements ChangeListener{

  JTabbedPane tabbedpane;
  JLabel indexLabel;

  public static void main(String[] args){
    JTabbedPaneTest14 frame = new JTabbedPaneTest14();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("タイトル");
    frame.setVisible(true);
  }

  JTabbedPaneTest14(){
    indexLabel = new JLabel();

    JPanel dispPanel = new JPanel();
    dispPanel.add(indexLabel);

    tabbedpane = new JTabbedPane();
    tabbedpane.addChangeListener(this);

    JPanel tabPanel1 = new JPanel();
    tabPanel1.add(new JButton("button1"));

    JPanel tabPanel2 = new JPanel();
    tabPanel2.add(new JLabel("Name:"));
    tabPanel2.add(new JTextField("", 10));

    JPanel tabPanel3 = new JPanel();
    tabPanel3.add(new JButton("button2"));

    tabbedpane.addTab("tab1", tabPanel1);
    tabbedpane.addTab("tab2", tabPanel2);
    tabbedpane.addTab("tab3", tabPanel3);

    getContentPane().add(tabbedpane, BorderLayout.CENTER);
    getContentPane().add(dispPanel, BorderLayout.PAGE_END);
  }

  public void stateChanged(ChangeEvent e) {
    int index = tabbedpane.getSelectedIndex();

    indexLabel.setText("Selected Index ： " + index);
  }