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

public class PhonePad implements ActionListener {

    private JFrame frame;
    private JPanel panel;
    private JTextField textField;

    public PhonePad() {
    }

    public void createWindow() {

        System.out.println("Initializing Window");

        frame = new JFrame("London Telepad");

        frame.addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                   System.exit(0);
               }
           });

        panel = new JPanel();
        panel.setLayout(new GridLayout(4, 3));
        
      
        JButton butt1 = new JButton("1");
        JButton butt2 = new JButton("2");
        JButton butt3 = new JButton("3");
        JButton butt4 = new JButton("4");
        JButton butt5 = new JButton("5");
        JButton butt6 = new JButton("6");
        JButton butt7 = new JButton("7");
        JButton butt8 = new JButton("8");
        JButton butt9 = new JButton("9" );
        JButton buttstar = new JButton("*");
        JButton butt0 = new JButton("0");
        JButton butthash = new JButton("#");

        buttc.addActionListener(this);
        butt0.addActionListener(this);
        butt1.addActionListener(this);
        butt7.addActionListener(this);
        butt8.addActionListener(this);
        
        
        panel.add(butt1);
        panel.add(butt2);
        panel.add(butt3);
        panel.add(butt4);
        panel.add(butt5);
        panel.add(butt6);
        panel.add(butt7);
        panel.add(butt8);
        panel.add(butt9);
        panel.add(buttstar);
        panel.add(butt0);
        panel.add(butthash);

        frame.getContentPane().add(panel);

        frame.setSize(200, 300);
        frame.setVisible(true);

        System.out.println("Window Initialized");
    }

    // method needed for testing with Robot class

    public JFrame getFrame() {

        return frame;
    }

    public static void main(String args[]) {

        PhonePad app = new PhonePad();
        app.createWindow();
    }

    public void actionPerformed(ActionEvent e) {

        // Display text of button on shell window
        System.out.print(e.getActionCommand());
    }
}

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

public class PhonePad implements ActionListener {

    private JFrame frame;
    private JPanel panel;
    private JTextField textField = new JTextField();

    public PhonePad() {
    }

    public void createWindow() {

        System.out.println("Initializing Window");

        frame = new JFrame("London Telepad");

        frame.addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                   System.exit(0);
               }
        });

        // Lets set a layout for the frame.
        frame.setLayout(new BorderLayout());

        // At the top lets add our textField.
        // We align the numbers to the right and then add it to the top panel.
        textField.setHorizontalAlignment(JTextField.RIGHT);
        frame.add(textField, BorderLayout.NORTH);

        panel = new JPanel();
        panel.setLayout(new GridLayout(4, 3));
        
        
        JButton butt1 = new JButton("1");
        JButton butt2 = new JButton("2");
        JButton butt3 = new JButton("3");
        JButton butt4 = new JButton("4");
        JButton butt5 = new JButton("5");
        JButton butt6 = new JButton("6");
        JButton butt7 = new JButton("7");
        JButton butt8 = new JButton("8");
        JButton butt9 = new JButton("C" );
        JButton buttstar = new JButton("*");
        JButton butt0 = new JButton("0");
        JButton butthash = new JButton("#");


        butt0.addActionListener(this);
        butt1.addActionListener(this);
        butt2.addActionListener(this);
        butt3.addActionListener(this);
        butt4.addActionListener(this);
        butt5.addActionListener(this);
        butt6.addActionListener(this);
        butt7.addActionListener(this);
        butt8.addActionListener(this);
        butt9.addActionListener(this);
        
        
        panel.add(butt1);
        panel.add(butt2);
        panel.add(butt3);
        panel.add(butt4);
        panel.add(butt5);
        panel.add(butt6);
        panel.add(butt7);
        panel.add(butt8);
        panel.add(butt9);
        panel.add(buttstar);
        panel.add(butt0);
        panel.add(butthash);

    
        // Lets put our number pad in the middle
        frame.getContentPane().add(panel, BorderLayout.CENTER);

        frame.setSize(200, 300);
        frame.setVisible(true);

        System.out.println("Window Initialized");
    }

    // method needed for testing with Robot class

    public JFrame getFrame() {

        return frame;
    }

    public static void main(String args[]) {

        PhonePad app = new PhonePad();
        app.createWindow();
    }

    public void actionPerformed(ActionEvent e) {

        // Get text from textfield
        String keyedin = textField.getText();

        // If this was issued by a key that reads "Delete" and there is values in the textfiled
        // then remove the last digit. otherwise add to the field as normal.

        if (e.getActionCommand().equals("C")) {
                if (keyedin.length() > 0) {
                        textField.setText(keyedin.substring(0,keyedin.length() - 1));
                }
        }
        else {
        
                textField.setText(textField.getText() + e.getActionCommand());
        }
    }
}