vector: synchronized data and synchronized method

[Yan Zhou]

One SCJD textbook says:

Vector provides synchronized methods to access data, but vector itself is not synchronized data, and there is a big difference.

I do not see how they are different from a programmer 's viewpoint: since all methods are synchronized, the internal data integrity of a vector is always maintained.

What did I miss?
Thanks.
Yan

[Rovas Kram]

If you have a reference to an object that is contained by a Vector, you can modify the value of that object in an thread un-safe manner. The synchronization just protects the list so-to-speak not the content.

[Mr. C Lamont Gilbert]

They have some really strange and confusing ways of wording those questions. I bet they think they are clear too...