代碼與老師相同，修改學(xué)生信息，能正常添加新的班級(jí)信息，但不會(huì)修改學(xué)生的班級(jí)信息，hibernate也沒(méi)有打印update語(yǔ)句。public ?void update() { Grade g = new Grade("Java四班","軟件開(kāi)發(fā)"); Session session = HibernateUtil.getSession(); Transaction t = session.beginTransaction(); Student s = (Student) session.get(Student.class, 2); g.getStudents().add(s); session.save(g); t.commit(); HibernateUtil.closeSession(session); }