Programmation c sous linux

import java.net.*;
public class ServeurE {
    public static void main(String[] args) {
        try{
    
            ServerSocket sSoc = new ServerSocket(2002);
            while(true){
                Socket inSock = sSoc.accept();
                SerThread st= new SerThread(inSock);
                st.start();
            
            }
            }
            catch(Exception e){
                System.out.println("erreur" + e.toString());
                
            }
            }
}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
public class SerThread extends Thread{
    Socket soc;
     BufferedReader m;
     PrintStream ma;
     String messa;
    SerThread(Socket insec){
        soc = insec;
    }
     public void run(){
        try{
             m = new BufferedReader(new InputStreamReader(soc.getInputStream()));
             ma= new PrintStream(soc.getOutputStream());
           
            do{
                               
                 messa = m.readLine();
                 ma.println(messa);    
                 System.out.println(""+soc.getInetAddress()+soc.getPort()+messa);
                
            }while(!soc.isClosed());
        } catch(Exception e){
                System.out.println("erreur" + e.toString());}
    
}
}

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.*;
public class ClientE {
    public static void main(String[] args) {
         Socket appsoc;
         String message;
         BufferedOutputStream in;
         BufferedReader j;
         PrintStream a;
         try {
             appsoc = new Socket("localhost", 2002);
             in = new BufferedOutputStream(appsoc.getOutputStream());
             a= new PrintStream(appsoc.getOutputStream());
             j=  new BufferedReader(new InputStreamReader(appsoc.getInputStream()));
             do{
                  System.out.println("enter message");
             BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
             message=br.readLine();
             a.println(message);
                 
             }while(!message.equals("fin"));
            
             }catch (Exception e) {
            System.out.println("erreur" + e.toString());
           

        }
   }
}