Соединение по TCP между компьютерами

import java.net.*;
import java.io.*;
public class Server {
   public static void main(String[] ar)    {
     int port = 80; 
       try {
         ServerSocket ss = new ServerSocket(port); 
         System.out.println("Waiting for a client...");
 
         Socket socket = ss.accept(); 
         System.out.println("Got a client :) ... Finally, someone saw me through all the cover!");
         System.out.println();
 
 
         InputStream sin = socket.getInputStream();
         OutputStream sout = socket.getOutputStream();
 
 
         DataInputStream in = new DataInputStream(sin);
         DataOutputStream out = new DataOutputStream(sout);
 
         String line = null;
         while(true) {
           line = in.readUTF(); 
           System.out.println("The dumb client just sent me this line : " + line);
           System.out.println("I'm sending it back...");
           out.writeUTF(line); 
           out.flush(); 
           System.out.println("Waiting for the next line...");
           System.out.println();
         }
      } catch(Exception x) { x.printStackTrace(); }
   }
}

import java.net.*;
import java.io.*;
 
public class client {
    public static void main(String[] ar) {
        int serverPort = 80;
        String address = ar[0];// при запуске получаем ip                         
 
        try {
            InetAddress ipAddress = InetAddress.getByName(address); 
            System.out.println("Any of you heard of a socket with IP address " + address + " and port " + serverPort + "?");
            Socket socket = new Socket(ipAddress, serverPort);
            System.out.println("Yes! I just got hold of the program.");
 
           
            InputStream sin = socket.getInputStream();
            OutputStream sout = socket.getOutputStream();
 
            
            DataInputStream in = new DataInputStream(sin);
            DataOutputStream out = new DataOutputStream(sout);
 
            
            BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
            String line = null;
            System.out.println("Type in something and press enter. Will send it to the server and tell ya what it thinks.");
            System.out.println();
 
            while (true) {
                line = keyboard.readLine();
                System.out.println("Sending this line to the server...");
                out.writeUTF(line);
                out.flush(); 
                line = in.readUTF(); 
                System.out.println("The server was very polite. It sent me this : " + line);
                System.out.println("Looks like the server is pleased with us. Go ahead and enter more lines.");
                System.out.println();
            }
        } catch (Exception x) {
            x.printStackTrace();
        }
    }
}