Java chat- server Application - Problem in forecasting messages to all connected clients? [closed]

Question

package chatserver;
import java.net.*;
import java.io.*;
public class ChatServer implements Runnable
{
    static ServerSocket server;
    static  Socket sc;
    private static  OutputStream ops;
    private static  InputStream ips;
    private static DataOutputStream dos;
    private static DataInputStream dis;
    private static String conversation ="";
    ChatServer() throws IOException
    {
            server = new ServerSocket(5000);
            System.out.println("Chat Server Started .... " );
            new Thread(this).start();

    }
public void run()
{
 try
    {
        while(true)
        {
            sc =  server.accept();
            ops = sc.getOutputStream();
            ips = sc.getInputStream();
            dos = new DataOutputStream(ops);
            dis = new DataInputStream(ips);
            String st = new String(dis.readUTF());
            conversation  = conversation + "\n"+st;
            System.out.println(conversation);
            send_to_all();
            dos.close();
            ops.close();
            sc.close();
        }
    }
    catch(IOException ie){}
}
private void send_to_all() throws IException
{
    dos.writeUTF(conversation);
}
public static void main(String[] args) throws IOException
{
     new ChatServer();
     InetAddress sl = server.getInetAddress();
     System.out.println("Address : "+sl);
}
}

Answer 1

You must (at least) maintain a list of connected clients if you want to be able to send them something.

Don't reinvent the wheel, peek what you need here: Building a Java chat server
See page 22, class Server, method sendToAll(String message)

Good luck!