задача решена, но остался вопрос

while (true){
           key=reader.readLine();
           if (key.equals("user")){person=new Person.User();doWork(person);}
           else  if (key.equals("loser")){person=new Person.Loser();doWork(person);}
           else  if (key.equals("coder")){person=new Person.Coder();doWork(person);}
           else  if (key.equals("proger")){person=new Person.Proger();doWork(person);}
           else break;
       }

while(key=reader.readLine().equals("user")||key.equals("loser")||key.equals("coder")||key.equals("proger")) {
}

boolean isKey = true;
        while (isKey){
        key = reader.readLine();
            switch (key) {
            ....
            ....
            default:
                isKey = false;
                return;
          }
         doWork(person);
   }