Create ServerMachine.java

import java.io.*;
import java.net.*;
public class ServerMachine
{
     public static void main(String[] args) throws Exception
     {
          ServerSocket sersock = new ServerSocket(3000);
          System.out.println("Server  ready for sending message...");
          Socket sock = sersock.accept( );                          
          //reading from keyboard (keyRead object)
          BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
          //sending to client (pwrite object)
          OutputStream ostream = sock.getOutputStream();
          PrintWriter pwrite = new PrintWriter(ostream, true);

          //receiving from server ( receiveRead  object)
          InputStream istream = sock.getInputStream();
          BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));

          String receiveMessage, sendMessage;               
          while(true)
          {
               if((receiveMessage = receiveRead.readLine()) != null)  
               {
                    System.out.println(receiveMessage);         
               }         
               sendMessage = keyRead.readLine();
               pwrite.println(sendMessage);             
               pwrite.flush();
          }               
     }                    
}