Implemeting ActionListeners

Question

This is my first time using the swing portion of java. I am kind of stuck on implementing the ActionListners for this assignment. The goal of this project is to create a handset that resembles a phone and have the user press the buttons which in turn will display the results in the display window. I ahve completed the majority of the assignment but I need some help with the event handling part.
I believe I need to create an action listener in both the toolbar and keypad classes and have the handset class get the results and have it set in the display.
Would some please explain why I can't use (this) in a static class.
Thanks for the help
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
//This is the Display Class and it's functions
class Display extends JTextField
     public static JTextField getDisplay()
          JFormattedTextField inputField = new JFormattedTextField();
          inputField.setEditable(false);
          return inputField;
//This is the ToolBar Class and it's functions
class ToolBar extends JPanel implements ActionListener
     public static JPanel getToolBar(){
          JPanel toolBar = new JPanel();
          toolBar.setLayout(new FlowLayout());
          JButton clear = new JButton("Clear");
          JButton dial = new JButton("Dial");
          toolBar.add(clear);
          toolBar.add(dial);
          return toolBar;
     public void actionPerformed(ActionEvent event)
          JLabel clearText;
          clear.addActionListener(this);
          System.out.println("I've been clicked");
//This is the KeyPad Class and it's functions
class KeyPad extends JPanel implements ActionListener
     public static JPanel getKeyPad(){
          JPanel keyPad = new JPanel();
          keyPad.setLayout(new GridLayout(4,3));
          JButton button[] = new JButton[9];
          for(int i=0; i<button.length; i++)
          {button[i] = new JButton(Integer.toString(i+1));
          keyPad.add(button);}
          JButton asterisk = new JButton("*");
          JButton zero = new JButton("0");
          JButton pound = new JButton("#");
          keyPad.add(asterisk);
          keyPad.add(zero);
          keyPad.add(pound);
          return keyPad;
     public void actionPerformed(ActionEvent event)
          System.out.println("I've been clicked");
//This is the Handset Class and it's functions
class Handset extends JFrame
     public Handset()
          super("Handset");
          getContentPane();
          setLayout(new BorderLayout());
          add(Display.getDisplay(), BorderLayout.NORTH);
          add(KeyPad.getKeyPad(),BorderLayout.CENTER);
          add(ToolBar.getToolBar(),BorderLayout.SOUTH);
          setSize(300, 600);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setVisible(true);
//This is my Driver
     public static void main(String[] args)
          new Handset();

Answer 1

Ok I think I may be missing something really simple. I have to create 3 classes that makes up the GUI which is brought together by the handset class. I completed this but now when I am trying to implement the event handler I am stuck do to the static placements. When I remove teh static I can't call the information from my classes. Would you please help clarify this?
//This is the KeyPad Class and it's functions
class ToolBar extends JPanel implements ActionListener
     public JPanel getToolBar(){
          JPanel toolBar = new JPanel();
          toolBar.setLayout(new FlowLayout());
          JButton clear = new JButton("Clear");
          JButton dial = new JButton("Dial");
          toolBar.add(clear);
          toolBar.add(dial);
          clear.addActionListener(this);
          return toolBar;
//This is the Handset Class and it's functions
class Handset extends JFrame
     public Handset()
          super("Handset");
          getContentPane();
          setLayout(new BorderLayout());
          add(getDisplay(), BorderLayout.NORTH);
          add(KeyPad.getKeyPad(),BorderLayout.CENTER);
          add(ToolBar.getToolBar(),BorderLayout.SOUTH);
          setSize(300, 600);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setVisible(true);
     }