[Ch14] Updating sharpen exercise

package ch14.btc;

import javax.swing.*;

import java.awt.BorderLayout;

import java.awt.*;

import java.awt.event.*;

class InnerButton {

  private JFrame frame;

  private JButton b;

  private JButton button;

  public static void main(String[] args) {

    InnerButton gui = new InnerButton();

  }

  public void go() {

    frame = new JFrame();

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation(

            JFrame.EXIT_ON_CLOSE);

    b = new JButton("A");

//    b.addActionListener();

    button = new JButton("A");

    button.addActionListener(new ButtonListener());

    frame.getContentPane().add(

            BorderLayout.SOUTH, b);

            BorderLayout.SOUTH, button);

    frame.setSize(200, 100);

    frame.setVisible(true);

  }

//  class BListener extends ActionListener {

//    public void actionPerformed(ActionEvent e) {

//      if (b.getText().equals("A")) {

//        b.setText("B");

//      } else {

//        b.setText("A");

//      }

//    }

//  }

  class ButtonListener implements ActionListener {

    public void actionPerformed(ActionEvent e) {

      if (button.getText().equals("A")) {

        button.setText("B");

      } else {

        button.setText("A");

      }

    }

  }

}

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