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Editorial Team
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Asked: 2026-06-15T18:54:28+00:00

I want to create a HashMap<String, HashMap<String, Long>> I know in guava we have

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I want to create a HashMap<String, HashMap<String, Long>>
I know in guava we have HashMultimap which is HashMap<String, HashSet<String>
but do we have some support for HashMap<String, HashMap<String, Long>> as well??

yes i can do that in core java, just looking for some library where i won’t have to check that a key exists everytime

I am explaining my problem with an example::
We have a device manufacturer, device name and device rank

now i need to return
list of devices for requested manufacturer – fewer requests
rank for particular device and manufacturer – lots of requests

In my case list of manufacturer and list of devices per manufacturer are quite big

any suggestion for an alternate datastructure is also welcomed.

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1 Answer

  1. Editorial Team

    It sounds like you might want a Table – possibly a HashBasedTable<String, String, Long>.

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