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

class Server {

public static ServerSocket servSock;
 public static Socket s = new Socket();
 public static BufferedReader input;
public static PrintWriter printwriter ;


public static void main(String []args)
{
    try
    {
        awaitConnection();
        setupReader();
    }
    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }
}

private static void awaitConnection() throws IOException {

    ServerSocket servSock = new ServerSocket(8080);
    System.out.println("Awaiting connection...");
    s = servSock.accept();
    InetAddress obj = s.getInetAddress();
    System.out.println("Connection established with " + obj);
}

private static void setupReader() throws IOException {
       while(true) {
        input = new BufferedReader(new InputStreamReader(s.getInputStream()));
        String msg = input.readLine();
        if(msg.contains("bye")) {
            break;
        }
        else {
            printwriter.println("this is a message from the server");
        }

        printwriter.flush();
          }
       s.close();

}
}

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

 class Client
 {
  static Socket clientSocket = null;
  static InetAddress obj = null;
  static PrintWriter output;
   static String message;
 static BufferedReader br;

public static void main(String []args)
{
    try
    {
        obj  = InetAddress.getByName(args[0]);
        connect();
        send();


    }
    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }
}
private static void connect() throws IOException {
    System.out.println("Trying to connect...");
    clientSocket = new Socket(obj, 8080);
    System.out.println("Your are connected to the server! nEnter Message:");
}
private static void send() throws IOException {

    while(true) {
    System.out.println(br.readLine());
    output = new PrintWriter(clientSocket.getOutputStream(), true);
    message = new Scanner(System.in).nextLine();
    output.println(message);
    if(message.contains("bye"))
    {
        break;
        }
    }
    output.close();
    clientSocket.close();

}
}