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Extending HashMap - Generics

843793Nov 23 2006 — edited Nov 24 2006

I fail to grasp the syntax/concept how to generically extend classes.
example/question 1. In order to retain generics, do I have to use:

MyMap<K,V> extends HashMap<K,V>

? (Why or Why not, please.)

2. How do I extend HashMap to force the value to be of type Set<?> ?
(Let's name this subclass HashMapA.)

3. Suppose I want to extend HashMapA so that its key is an Integer?

TIA
nat

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Locked on Dec 22 2006

Added on Nov 23 2006

#generics

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