如何包装Hibernate会话API避免“未经检查的”泛型警告

Question

I'm coding a wrapper for Hibernate Session API:

    @SuppressWarnings("unchecked")
    public <T> List<T> execQuery(String hql){
    Session s=sf.getCurrentSession();
    return s.createQuery(hql)
                .list();
}

The list() function of Hibernate Session API seems using raw type. so How can I wrapper this function, and let the client of my wrapper to safyly using like this:

  List<BusinessObject> bo= xxx.execQuery(...);

Answer 1

There's no way to avoid having @SuppressWarnings("unchecked") in at least one place.

Since List is a raw type you'll have to do an unchecked conversion somewhere . The best you can do is to keep it contained to one place, which is what you're doing with execQuery.