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

public class MyFrame extends JFrame {

    class MyActionListener implements ActionListener {
        JPanel panel;
        MyActionListener(JPanel _panel) {
            panel = _panel;
        }

        @Override
        public void actionPerformed(ActionEvent ae) {
            MyFrame.this.add(panel, BorderLayout.CENTER);
            //MyFrame.this.revalidate();
            //MyFrame.this.repaint();
            panel.revalidate();
            panel.repaint();
        }
    }

    JPanel buttonPanel = new JPanel();

    JButton firstButton = new JButton("first");
    JPanel firstPanel = new JPanel();
    JTextPane firstPane = new JTextPane();
    JTextField firstField = new JTextField("first field");

    JButton secondButton = new JButton("second");
    JPanel secondPanel = new JPanel();
    JTextPane secondPane = new JTextPane();
    JTextField secondField = new JTextField("second field");

    MyFrame() {
        firstPane.setText("first pane");
        firstPanel.setLayout(new BorderLayout());
        firstPanel.add(firstPane, BorderLayout.CENTER);
        firstPanel.add(firstField, BorderLayout.SOUTH);
        firstButton.addActionListener(new MyActionListener(firstPanel));

        secondPane.setText("second pane");
        secondPanel.setLayout(new BorderLayout());
        secondPanel.add(secondPane, BorderLayout.CENTER);
        secondPanel.add(secondField, BorderLayout.SOUTH);
        secondButton.addActionListener(new MyActionListener(secondPanel));

        buttonPanel.setLayout(new GridLayout(0,1));
        buttonPanel.add(firstButton);
        buttonPanel.add(secondButton);

        add(buttonPanel, BorderLayout.WEST);
        add(firstPanel, BorderLayout.CENTER);

        setSize(new Dimension(300,300));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new MyFrame();
    }
}