Is this a correct implementation

I was looking into the Collections frame work source code of core java 1.5 and came across this.
Hashmap extends AbstractMap class
AbstractMap class has impleneted map interface
AGAIN
Hashmap implements map interface
is there any need to implement an interface twice in parent class and in the chil class.
Shasi

look here [http://forums.sun.com/thread.jspa?forumID=24&threadID=5246174|http://forums.sun.com/thread.jspa?forumID=24&threadID=5246174]

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