[hardwired]

Code:

C:\jexp>javac sandboxrx.java
sandboxrx.java:21: cannot find symbol
symbol  : class ActionEvent
location: class SandBoxRx
    public void actionPerformed(ActionEvent e){
                                ^
sandboxrx.java:14: cannot find symbol
symbol  : class ActionListener
location: class SandBoxRx
        button.addActionListener(new ActionListener());
                                     ^
2 errors

1 - import java.awt.event.*;
recompile:

Code:

C:\jexp>javac sandboxrx.java
sandboxrx.java:15: java.awt.event.ActionListener is abstract; cannot be instantiated
        button.addActionListener(new ActionListener());
                                 ^
1 error

Code:

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

public class SandBoxRx implements ActionListener {
    private void makeGUI(){
        JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());

        JButton button = new JButton("Login");
        // The jvm is looking for the "ActionListener" class
        // on your classpath. Since ActionListener is a Java
        // class then this is doubly confusing.
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("anonymous ActionListener");
            }
        });
        button.addActionListener(this);
        button.addActionListener(new SandBoxListener());
        frame.add(button);

        frame.pack();
        frame.setVisible(true);
    }

    // Implementation of ActionListener interface
    // implemented by the enclosing class.
    public void actionPerformed(ActionEvent e){
        System.out.println("Enclosing class-implemented ActionListener");
    }

    private class SandBoxListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            System.out.println("SandBoxListener ActionListener");
        }
    }

    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable(){
            public void run(){
                new SandBoxRx().makeGUI();
           }
        });
    }
}