[Ch14] TwoButtons with lambda expressions

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class TwoButtons {

  private JFrame frame;

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JButton labelButton = new JButton("Change Label");

    labelButton.addActionListener(new LabelListener());

    labelButton.addActionListener(event -> label.setText("Ouch!"));

    JButton colorButton = new JButton("Change Circle");

    colorButton.addActionListener(new ColorListener());

    colorButton.addActionListener(event -> frame.repaint());

    label = new JLabel("I’m a label");

    MyDrawPanel drawPanel = new MyDrawPanel();

    RandomColorPanel drawPanel = new RandomColorPanel();

    frame.getContentPane().add(BorderLayout.SOUTH, colorButton);

    frame.getContentPane().add(BorderLayout.CENTER, drawPanel);

    frame.getContentPane().add(BorderLayout.EAST, labelButton);

    frame.getContentPane().add(BorderLayout.WEST, label);

    frame.setSize(300, 300);

    frame.setSize(500, 400);

    frame.setVisible(true);

  }

  class LabelListener implements ActionListener {

    public void actionPerformed(ActionEvent event) {

      label.setText("Ouch!");

    }

  } 

  class ColorListener implements ActionListener {

    public void actionPerformed(ActionEvent event) {

      frame.repaint();

    }

  }  

}