public static Object getFieldValue(Object obj, String fieldName) {
        try {
            Field field = obj.getClass().getDeclaredField(fieldName);
            field.setAccessible(true);
            return field.get(obj);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
@Test
    void testGetFieldValueWithoutField() {
        assertThrows(RuntimeException.class, () -> {
            ReflectUtils.getFieldValue(listStr, "elementDataxx");
        });
    }