Java - Data broadcasting

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

	public class Server implements Runnable {
	    ServerSocket serverSocket = null;
	    Socket socket = null;
	    ArrayList clientHandlerList = new ArrayList();
	    ClientHandler clientHandler = null;
	    BufferedReader readFromKeyboard = null;

	    public Server() {
	        try {
	            serverSocket = new ServerSocket(4444);
	            readFromKeyboard = new BufferedReader(
	                new InputStreamReader(System.in));
	            new Thread(this).start();

	            while (true) {
	                String message = readFromKeyboard.readLine();
	                broadcast(message);
	            }
	        } catch (Exception exp) {
	            exp.printStackTrace();
	        }
	    }

	    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();
	    }
	}

	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.*;

	public class Client implements Runnable {
	    Socket socket = null;
	    BufferedReader readFromServer = null;

	    public Client() {
	        try {
	            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 run() {
	        try {
	            while (true) {
	                String message = readFromServer.readLine();
	                System.out.println(message);
	            }
	        } catch (IOException ioExp) {
	            ioExp.printStackTrace();
	        }
	    }

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