Simple Client Server Using Java

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

class server {
  Thread t;
  String name;
  try {
    static ServerSocket s = new ServerSocket(8083);
    static Socket socket;
  }
  catch () {}

  server(String threadname) {
    name = threadname;
    t = new Thread(name);
    System.out.println("New thread: " + t);
    t.start(); // Start the thread
  }

  public void run() {
    while (true) {
      try {

        BufferedReader input;
        input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        while (true) {
          String message = input.readLine();
          if (message == null) {
            break;
          }
          System.out.println(message);
        }
      }
      catch (IOException e) {
        System.out.println(e);
      }
    }
  }

  public static void main(String[] args) throws UnknownHostException,
      IOException {
    int i = 0;
    while (!s.accept().equals(socket)) {
      new server("a" + i);
    }
  }
}


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

class client {
  public static void main(String[] args) throws UnknownHostException,
      IOException {
    System.out.println("Hello World!");
    Socket s = new Socket("localhost", 8083);
    String lineToBeSent;
    BufferedReader input;
    PrintWriter output;
    input = new BufferedReader(new InputStreamReader(System.in));
    output = new PrintWriter(s.getOutputStream(), true);
    while (true) {
      lineToBeSent = input.readLine();
      if (lineToBeSent.equals(".")) {
        break;
      }
      output.println(lineToBeSent);
    }
  }
}

Simple Client Server Using Java