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You could have your employee hashmap also have a pointer back to the correct element in the linked list of the zip code hashmap.
- Anonymous March 26, 2015Alternatively, you could handle this an easier way that requires no modification to the standard hashmap libraries. As each entry comes in, assign it an auto-incremented ID (use a 64-bit integer so you don't run out of IDs). Then take the employee record and insert into a hash map that maps ID to employee record. Then have two auxillary lookups, one for name -> id and another for zip -> list of IDs. You can see that this is nicely extensible in that you can extend this to as many search criteria as you want.