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

public class Server {
   
   public static int threads = 0;
   
   public static void main(String[] args) throws IOException {
      ServerSocket serverSocket = null;
       
      try {
          serverSocket = new ServerSocket(5421);
      } 
      catch (IOException e) {
         System.err.println("Could not listen on port: 5421.");
         System.exit(-1);
      }

      while (true) {
          System.out.println("Listening for Clients....");
          new ServerThread(serverSocket.accept()).start(); // if gets aproached by client sets up new thread to deal
          ++threads;  // increments non of threads by 1
          System.out.println("Client thread initiated - thread count = " + threads);
      }
   }
}