TreeSet and it's interface

[Rajinder Yadav]

I'm reviewing collections, and of all the books I've read and other web-sites I come across all seem to indicate that the TreeSet implements the SortSet interface.
While looking through JDK I came across this:
"This class (java.util.TreeSet) implements the Set interface, backed by a TreeMap instance. ... "
It this an error in the jdk doc? Can someone explain the anomalies here?

[Valentin Crettaz]

Actually it is backed by a SortedMap
From the source:

private transient SortedMap m;       // The backing Map
private transient Set       keySet;  // The keySet view of the backing Map

[Rajinder Yadav]

Great work Valetin, I guess the source code can't lie ... the ultimate reference
So if I come across a ture/false type exam question asking if a TreeSet implements the SortSet interface I should answer false!
[ February 28, 2002: Message edited by: Rajinder Yadav ]

[swapna sivaraju]

Hi
Yeah i also came across this confusing statement..
can anyone elaborate on this.....
what does this mean--"-backed by TreeMap instance"..
Swapna