//Quiz3.java
import java.awt.*;
import javax.swing.*;

class Quiz3 {
  public static void main(String[] args) {
    JFrame frame = new JFrame("Quiz3");
    Container pane = frame.getContentPane();
    pane.setLayout(new FlowLayout());
    JButton counter = new JButton("0");
    JButton quit = new JButton("Quit");
    GoodBye listener = new GoodBye();
    counter.addActionListener(new Counter());
    quit.addActionListener(listener);
    pane.add(counter);
    pane.add(quit);
    frame.pack(); 
    frame.show(); 
  }
}

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

class Counter implements ActionListener  { 
  public void actionPerformed(ActionEvent e) {
    int value = Integer.parseInt(e.getActionCommand());
    JButton button = (JButton)e.getSource();
    button.setText(String.valueOf(value+1));
  }
}

//GoodBye.java
import java.awt.event.*; 

class GoodBye implements ActionListener  { 
  public void actionPerformed(ActionEvent e) {
    System.out.println("Goodbye!"); 
    System.exit(0); 
  }
}