Пример Клиент - Графичен интерфейс

Client avec nom et GUI

import java.net.*;
import java.awt.*;
import java.io.*;
import java.awt.event.*;

public class Client {
   BufferedReader in;
   PrintWriter out;
   InetAddress addr;
   Socket socket;
   String name;
   Gui g;
   Client(Frame f){
       g = new Gui(f);
   }

   class Gui{
       TextArea serv;
       TextField cl;
       Gui (Frame f){
           f.setLayout(new BorderLayout());
           serv = new TextArea(20,10);
serv.setEditable(false);
           cl = new TextField(30);
           f.add("Center",serv);
           f.add("South",cl);
           cl.addActionListener(new SrvL());
       }
       class SrvL implements ActionListener{
           public void actionPerformed(ActionEvent e){
               try{
                   String st=cl.getText();
                    send(st);
                   cl.setText("");
                   serv.append(receive()+"\n");
               }
               catch (Exception ex){
                   System.out.println("exception: "+ex);
                   System.out.println("closing...");
                   try{
                       socket.close();
                   }
                   catch (Exception expt){
                       System.out.println(expt);
                   }
               }
           }
       }
   }
   public void init()throws IOException{
       try{
           String server = null;
           InetAddress addr = InetAddress.getByName(server);
           System.out.println("addr = " + addr);
           socket = new Socket(addr, MultiClientServer.PORT);
           System.out.println("socket = " + socket);
           BufferedReader sin = new BufferedReader(
                   new InputStreamReader(System.in));
           in = new BufferedReader(
                   new InputStreamReader(socket.getInputStream()));
           // Output is automatically flushed
           // by PrintWriter:
           out = new PrintWriter(new BufferedWriter(
                   new OutputStreamWriter(socket.getOutputStream())),true);
           System.out.print("Your name: ");
           name = sin.readLine();
       }catch (Exception e){
           System.out.println("exception: "+e);
           System.out.println("closing...");
           socket.close();
       }

   }
   void send(String s){
       if(s.length()==0){
           out.println("END");
           System.out.println("closing...");
           try{
               socket.close();
           }
           catch (Exception expt){
               System.out.println(expt);
           }
           System.exit(0);
       }
       else out.println(name+": "+s);

   }
   String receive()throws IOException{
       return in.readLine();
   }

   public static void main(String[] args )throws IOException{
       Frame frame =new Frame();
       Client cl = new Client(frame);
       cl.init();
       frame.setTitle(cl.name);
       frame.setSize(500,300);
       frame.setVisible(true);
   }

}