Given a class that is mapped in Hibernate, you can get the table name that it is mapped to with the following piece of code.

import org.hibernate.SessionFactory;
import org.hibernate.persister.entity.Joinable;

public String getTableName(SessionFactory sessionFactory, Class<?> mappedClass)
{
    ClassMetadata cmd = sessionFactory.getClassMetadata(mappedClass);

    //check that the class is mapped to something with a table name
    if (cmd == null || !Joinable.class.isInstance(cmd))
        return null;

    return Joinable.class.cast(cmd).getTableName();
}