CODEWITHSUNDEEP
javahashmapfactory-pattern
bench mark
bench mark

Reputation: 11

Hashmap generic

I want to create a hashmap where the key is of interface A, and the value is of interface B. Then I want to initialize it with classes that implements A and B. Is it possible to do it with java generics?

That is, I want to have something like

hashmap<<? implements A>, <? implements B>> _map;
_map.put(a1, b1);

where a1 implements A; and b1 implements B.

The original intent is that I want to create a factory, so that I can look up on a1 and return an instance of b1.

Upvotes: 0

Views: 732

Answers (3)

erickson
erickson

Reputation: 269797

 Map<A, B> map = new HashMap<A, B>();
 map.put(a1, b1);

Upvotes: 3

Kent
Kent

Reputation: 195199

this may be what you are looking for:

HashMap<A,B> map = new HashMap<A,B>();

map.put(a1,b1);

Upvotes: 0

MByD
MByD

Reputation: 137382

Yes it's possible, it would be enough to write:

Map<A, B> _map = HashMap<A, B>();

Upvotes: 0

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