public class GsonTest {
    public static void main(String[] args) {
        StudentDAOImpl studentDAO = new StudentDAOImpl();
        Gson gson = new Gson();
        List studentList = new ArrayList<>();
        Student student1 = studentDAO.findStudentByID(4);
        Student student2 = studentDAO.findStudentByID(5);
        studentList.add(student1);
        studentList.add(student2);
        String json = gson.toJson(studentList);
        System.out.println(json);
    }
}