Java - Data broadcasting using GUI

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

	public class Server extends JFrame implements Runnable, ActionListener {
	    ServerSocket serverSocket = null;
	    Socket socket = null;
	    ArrayList clientHandlerList = new ArrayList();
	    ClientHandler clientHandler = null;
	    JTextField chatField = null;
	    JTextArea chatArea = null;
	    JButton sendButton = null;

	    public Server() {
	        try {
	            initComponents();
	            serverSocket = new ServerSocket(4444);
	            new Thread(this).start();
	        } catch (Exception exp) {
	            exp.printStackTrace();
	        }
	    }

	    public void initComponents() {
	        setSize(270, 507);
	        setResizable(false);
	        setLayout(null);
	        chatArea = new JTextArea();
	        chatField = new JTextField(20);
	        chatArea.setForeground(Color.BLACK);
	        sendButton = new JButton("SEND");
	        chatArea.setEditable(false);
	        chatArea.setBounds(5, 5, 250, 400);
	        chatField.setBounds(5, 410, 250, 30);
	        sendButton.setBounds(175, 450, 80, 20);
	        sendButton.addActionListener(this);

	        chatField.addKeyListener(new KeyAdapter() {
	            public void keyReleased(KeyEvent evt) {
	                if (evt.getKeyCode() == KeyEvent.VK_ENTER) {
	                    sendButtonAction();
	                }
	            }
	        });

	        add(chatArea);
	        add(chatField);
	        add(sendButton);
	        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	        setLocationRelativeTo(this);
	    }

	    public void actionPerformed(ActionEvent evt) {
	        if (evt.getSource() == sendButton) {
	            sendButtonAction();
	        }
	    }

	    public void sendButtonAction() {
	        String message = chatField.getText();
	        chatField.setText("");
	        chatArea.append(message + "\n");
	        broadcast(message);
	    }

	    public void run() {
	        try {
	            while (true) {
	                socket = serverSocket.accept();
	                clientHandler = new ClientHandler(socket, this);
	                clientHandlerList.add(clientHandler);
	            }
	        } catch (Exception exp) {
	            exp.printStackTrace();
	        }
	    }

	    public void broadcast(String message) {
	        ClientHandler client;
	        for (int i = 0; i < clientHandlerList.size(); i++) {
	            client = (ClientHandler) clientHandlerList.get(i);
	            client.sendMessage(message);
	        }

	    }

	    public static void main(String[] args) {
	        new Server().setVisible(true);
	    }
	}

	import java.io.*;
	import java.net.*;

	public class ClientHandler {
	    Socket socket = null;
	    Server server = null;
	    PrintWriter writeToClient = null;

	    public ClientHandler(Socket socket, Server server) {
	        try {
	            this.socket = socket;
	            this.server = server;
	            writeToClient = new PrintWriter(socket.getOutputStream());
	        } catch (IOException exp) {
	            exp.printStackTrace();
	        }
	    }

	    public void sendMessage(String message) {
	        writeToClient.println(message);
	        writeToClient.flush();
	    }
	}

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

	public class Client extends JFrame implements Runnable {
	    Socket socket = null;
	    BufferedReader readFromServer = null;
	    JTextArea chatArea = null;

	    public Client() {
	        try {
	            initComponents();
	            socket = new Socket("localhost", 4444);

	            readFromServer = new BufferedReader(
	                new InputStreamReader(socket.getInputStream()));

	            new Thread(this).start();

	        } catch (UnknownHostException exp) {
	            exp.printStackTrace();
	        } catch (IOException exp) {
	            exp.printStackTrace();
	        }
	    }

	    public void initComponents() {
	        setSize(270, 480);
	        setResizable(false);
	        setLayout(null);
	        chatArea = new JTextArea();
	        chatArea.setForeground(Color.BLACK);
	        chatArea.setEditable(false);
	        chatArea.setBounds(5, 5, 250, 400);

	        add(chatArea);

	        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	        setLocationRelativeTo(this);
	    }

	    public void run() {
	        try {
	            while (true) {
	                String message = readFromServer.readLine();
	                chatArea.append(message + "\n");
	            }
	        } catch (IOException ioExp) {
	            ioExp.printStackTrace();
	        }
	    }

	    public static void main(String[] args) {
	        new Client().setVisible(true);
	    }
	}