Question about UniDirectional Assosiation in ClassDiagram

I am going through "UML distilled" book by martin flower and I got the following scenario.

There is an Uni Directional Assosiation from Order to OrderLine

like

Order ---> OrderLine

But the code which representing above relation is given as

Public class OrderLine {

.......
private Order
.........

}

i.e OrderLine class has Order as instance variable .

Is it correct representation ?

Chakra

Hello Chakra,

I've been using together for eclipse and when I draw associations it gives me 3 choices for navigation: NAVIGABLE, NAVIGABLE EXPLICITLY and NOT NAVIGABLE. This is for a UML 2.0 project by the way. When NOT NAVIGABLE is selected an X marks the NOT NAVIGABLE end.
For example: order -X----> orderline.
I'm not sure what the UML 2.0 spec says about this though.
Still, it looks like that example has been miswriten.

Mark Cade has shown bi-directional association between Order and LineItem in his case study.

[Order] 1 --- * [LineItem]

Thanks Guys for the replies.

It looks like Martin flower also corrected this code in the next printing .

I found this info in book's errata.(http://martinfowler.com/umlsupp/umlErrata.html)
"
Page 39: In the code at the end the line "private Order order;" should be deleted. (There's no navigability from order line to order in fig 3.1 so there should be no field). For the same reason in code at the top of page 40 the line "public Order order;" should also be deleted. [Corrected in the 8th Printing]

"