Java basic client server linking program on command line. Server [port_number] Client [ip_address] [port_number]

Client.java

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

public class Client {
  int i;
  static String iaddr;
  static int port;
  
  public Client() {
     try{
         Socket socket=new Socket(InetAddress.getByName(iaddr),port);
         DataOutputStream outstream = new DataOutputStream(socket.getOutputStream());
 
         InputStreamReader isr = new InputStreamReader(System.in);
         BufferedReader br = new BufferedReader(isr);
         System.out.println("Input data on keyboard...");

         while(true) {
             i = br.read();
             outstream.writeInt(i);
         }
      }

      catch(IOException e){
         System.out.println(e.getMessage());
      }
  }

  public static void main(String args[]) {
      if (args.length < 2){
         System.out.println("USAGE: java Client [iaddr] [port]");
         System.exit(1);
      }

      iaddr= args[0];
      port=Integer.parseInt(args[1]);
      Client ClientStart=new Client();
  }
}

Server.java

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

public class Server {
  Socket  socket;
  static int port;
  int messagein;

  public Server() {
     try{
         ServerSocket SS = new ServerSocket(port);
         System.out.println("Server is created and waiting Client to connect...");

         Socket socket = SS.accept();
         System.out.println("Client IP = " +
                             socket.getInetAddress().getHostAddress());
         DataInputStream instream = new DataInputStream(socket.getInputStream());

         while(true) {
            messagein = instream.readInt();
            System.out.print((char)messagein);
         }
      }
      catch(IOException e){
         System.out.println(e.getMessage());
      }  	
  }

  public static void main(String args[]){
         if(args.length < 1){
            System.out.println("Usage: java Server [port]");
            System.exit(1);
         }
         port=Integer.parseInt(args[0]);
         Server ServerStart=new Server();
  }
}