srv

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

public class MultiEchoServer {
    public static void main(String[] args) {
        try {
            ServerSocket s = new ServerSocket(4444);
            while (true) {
                Socket incoming = s.accept();
                new ClientHandler(incoming).start();
            }
        } catch (Exception e) {}
    }
}

class ClientHandler extends Thread {
    protected Socket incoming;
    public ClientHandler(Socket incoming) {
        this.incoming = incoming;
    }
    public void run() {
        try {
            BufferedReader in
                = new BufferedReader(
                    new InputStreamReader(
                        incoming.getInputStream()));
            PrintWriter out
                = new PrintWriter(
                    new OutputStreamWriter(
                        incoming.getOutputStream()));
            out.println("Hello! ...");
            out.println("Enter BYE to exit.");
            out.flush();
            while (true) {
                String str = in.readLine();
                if (str == null) {
                    break;
                } else {
                    out.println("Echo: " + str);
                    out.flush();
                    if (str.trim().equals("BYE"))
                        break;
                    }
            }
            incoming.close();
        } catch (IOException e) {}
    }
}