การ login ด้วย server และ client จาวา

new Thread(){

       private PrintWriter writer;

       public void sendObj(Object obj){
                 try{

                      if(writer != null){
                                writer.println(obj);
                      }
                 }catch(Exception err){}
       }

       public void run(){
                synchronized(this.getClass()){
                          try{

                               Socket socket = new Socket("netAdress",port);
                              
                               writer = new PrintWriter(socket.getOutputStream());

                               sendObj(id+","+pass);
                          }catch(Exception err){}
                }
       }
}