import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JButton;

import javax.swing.JPanel;

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.BorderLayout;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

public class Telephone extends JFrame implements ActionListener

{

private JLabel output;

private JButton clear;

private JButton[] buttons;

public Telephone()

{

//JJFrame Stuff

setSize(400,400);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setTitle("Telephone");

//initalize components

output = new JLabel(" ", JLabel.CENTER);

clear = new JButton("CLEAR");

buttons = new JButton[12];

for (int i = 0; i <= 9 ; i ++)

buttons[i] = new JButton(""+i);

buttons[10] = new JButton("#");

buttons[11] = new JButton("*");

//set up a panel

JPanel center = new JPanel();

center.setLayout(new GridLayout(4,3));

for (int i = 1; i <= 9; i ++)

center.add(buttons[i]);

center.add(buttons[10]);

center.add(buttons[0]);

center.add(buttons[11]);

//set up the layout of the frame

Container pane = this.getContentPane();

pane.setLayout (new BorderLayout());

pane.add(output, BorderLayout.NORTH);

pane.add(center, BorderLayout.CENTER);

pane.add(clear, BorderLayout.SOUTH);

//set up the actionlisteners

for (int i = 0; i < 12; i ++)

buttons[i].addActionListener(this);

clear.addActionListener(this);

//make it visible

setVisible (true);

}

public void actionPerformed (ActionEvent e)

{

String action = e.getActionCommand();

if (action.equals("CLEAR"))

output.setText(" ");

else

output.setText(output.getText()+action);

}

public static void main (String[] args)

{

Telephone t = new Telephone();

}

}