Unable to create thread

Question

i wrote a code of a multiclient server ,but when i compile it i can't see any window opening nor ant thread class is being created.... please help
SERVER:
import java.io.*;
import java.net.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
public class MultiThreadedServer3 extends JFrame implements Runnable {
    private JTextArea jta = new JTextArea();
    public  Vector v;
    String messageReceived;
    BufferedReader inputFromClient = null;
    PrintWriter outputToClient = null;
    String client_name = null;
    public int z;
    Thread t = null;
    Socket socket = null;
    /** Creates a new instance of MultiThreadSimpleServer */
    public void MultiThreadedServer3() {
        // place text area on the frame
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(new JScrollPane(jta), BorderLayout.CENTER);
        setTitle("Simple Server");
        setSize(500, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        jta.setEditable(false);
        try {
            ServerSocket serverSocket = new ServerSocket(4242);
            System.out.println("Server is upp and running");
            jta.append("Server started at " + new Date() + "\n");
            while (true) {
              socket = serverSocket.accept(); // accept connections
            InetAddress inetAddress = socket.getInetAddress(); // used to get host information
            /* Get host IP and hostname and display on the window */
            jta.append("Client connected to the server!\n" +
                     "\n" +
                    "Client's IP Address is: " + inetAddress.getHostAddress() + "\n");
            // Create a new thread for connection
            v = new Vector();
            t = new Thread(this); // create a new thread
            t.start();
        catch (IOException ex) {
            System.err.println(ex);
    } //close MiultiThreaddeServer3();
        synchronized public void send()
                throws IOException
            outputToClient.println(messageReceived);
        synchronized public void send_personal()
                throws IOException
        {   /* to get the position of the person's name
             * with whom the client wants to cummunicate
            int m=messageReceived.indexOf((String)(v.elementAt(z)));
            // /* the message sent to the receiver will be the <sender's name> + message */
            outputToClient.println("<"+client_name+">"+messageReceived.substring(m));
        @Override
       synchronized public void run() {
            try {
                 inputFromClient = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                 outputToClient = new PrintWriter(socket.getOutputStream(),true);
                 client_name = inputFromClient.readLine();
                 v.addElement(client_name);
                 outputToClient.println("Welcome, "+client_name+"the current users on the chat are :");
                 for(int j =0;j<v.size();j++)
                     if(v.isEmpty())
                         outputToClient.println("none,you are the initiator! Go on.... ");
                     else
                     outputToClient.println(v.elementAt(j));
                 outputToClient.println("To message to all write : 'MSG' followed by your message");
                 outputToClient.println("To private message: 'username' 'your mesage' ");
                while (true) {
                    messageReceived = inputFromClient.readLine();
                    if(messageReceived.startsWith("MSG"))
                    for(int i=0;i<v.size();i++)
                          // v.elementAt(i).toString();
                        ((MultiThreadedServer3)(v.elementAt(i))).send();
                    for(z=0;z<v.size();z++)
                        if(messageReceived.startsWith((String)(v.elementAt(z))));
                        ((MultiThreadedServer3)(v.elementAt(z))).send_personal();
                       } // close while
            } //close try
            catch (IOException ex)
                System.err.println(ex);
       } // close run
    public static void main(String[] args) {
        new MultiThreadedServer3();
} // close MultiThreadServer

Answer 1

my client code is as follows:
CLIENT:
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.awt.*;
import javax.swing.*;
public class SimpleClient extends JFrame implements ActionListener {
    private JTextField jtfMessageToSend = new JTextField();
    private JTextArea jtaMessageReceived = new JTextArea();
    private JButton btnSend = new JButton("Send");
    private PrintWriter toServer;
    private BufferedReader fromServer;
    /** Creates a new instance of SimpleClient */
    public SimpleClient() {
        JPanel p = new JPanel();
        p.setLayout(new BorderLayout());
        p.add(new JLabel("Message to send: "), BorderLayout.WEST);
        btnSend.addActionListener(this);
        btnSend.setMnemonic('s');
        //btnSend.setActionCommand("active");
        p.add(btnSend, BorderLayout.EAST);
        p.add(jtfMessageToSend, BorderLayout.CENTER);
        jtfMessageToSend.setHorizontalAlignment(JTextField.LEFT);
        jtaMessageReceived.setEditable(false);
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(p, BorderLayout.SOUTH);
        getContentPane().add(new JScrollPane(jtaMessageReceived), BorderLayout.CENTER);
        jtfMessageToSend.addActionListener(this);
        setTitle("SimpleClient");
        setSize(500, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        try {
            Socket socket = new Socket("localhost", 4242);
            fromServer = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            toServer = new PrintWriter(socket.getOutputStream(),true);
        catch (IOException ex) {
            jtaMessageReceived.append(ex.toString());
    public void actionPerformed(ActionEvent e) {
        String actionCommand = e.getActionCommand();
        if (e.getSource() instanceof JTextField || e.getSource() == btnSend) {
            toServer.println(jtfMessageToSend.getText());
                toServer.flush();
                jtfMessageToSend.setText("");
            while(!(jtfMessageToSend.getText()).equals("bye"))
            try
                String messageToDisplay = fromServer.readLine();
                jtaMessageReceived.append(messageToDisplay + "\n");
                toServer.println(jtfMessageToSend.getText());
                //toServer.flush();
                jtfMessageToSend.setText("");
            catch (IOException ex) {
                System.out.println("Error in cummunication" +ex);
    public static void main(String[] args) {
        new SimpleClient();
}