[collections] HashMap with multiple values for one key

[Denis Avdic <de...@betterway.net>]

Hello,

I know this is probably a really stupid question but i am looking for a 
HashMap (or similar)implementation that will store multiple objects 
under the same key.  I wrote a superficial implementation myself  based 
on the HashMap, but I am interested to know if there is something out 
there already implementing this functionality.  I really couldn't 
decypher if multimap would do this.

Thanks,

Denis

Re: [collections] HashMap with multiple values for one key

[Erik Price <ep...@ptc.com>]

Rob Leland wrote:
> Denis Avdic wrote:
> 
>> Hello,
>>
>> I know this is probably a really stupid question but i am looking for 
>> a HashMap (or similar)implementation that will store multiple objects 
>> under the same key.  I wrote a superficial implementation myself  
>> based on the HashMap, but I am interested to know if there is 
>> something out there already implementing this functionality.  I really 
>> couldn't decypher if multimap would do this. 
> 
> 
> Why not just store an object which itself is a container.
> 
> Either a class with public member functions, it could be a list, or even 
> another Map ?

Possiblies

1. If you want to use an object that implements Map but don't want to 
bother to implement all the stubs.

2. Item 30 of Effective Java: Know and Use Libraries




Erik

Re: [collections] HashMap with multiple values for one key

[Denis Avdic <de...@betterway.net>]

Well, I want an option of taking out a key at a time with one function 
call. (as in get).  Being able to get the entire collection would be a 
bonus.

I'll end up extending MultiHashMap so a get gets me the top of the stack 
(or bucket, whatever you want to call it) and a getCol gets me the 
entire contents of the key...


Rob Leland wrote:

> Denis Avdic wrote:
>
>> Hello,
>>
>> I know this is probably a really stupid question but i am looking for 
>> a HashMap (or similar)implementation that will store multiple objects 
>> under the same key.  I wrote a superficial implementation myself  
>> based on the HashMap, but I am interested to know if there is 
>> something out there already implementing this functionality.  I 
>> really couldn't decypher if multimap would do this. 
>
>
> Why not just store an object which itself is a container.
>
> Either a class with public member functions, it could be a list, or 
> even another Map ?
>
>>
>>
>> Thanks,
>>
>> Denis
>
>
>
>
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Re: [collections] HashMap with multiple values for one key

[Rob Leland <rl...@apache.org>]

Denis Avdic wrote:

> Hello,
>
> I know this is probably a really stupid question but i am looking for 
> a HashMap (or similar)implementation that will store multiple objects 
> under the same key.  I wrote a superficial implementation myself  
> based on the HashMap, but I am interested to know if there is 
> something out there already implementing this functionality.  I really 
> couldn't decypher if multimap would do this. 

Why not just store an object which itself is a container.

Either a class with public member functions, it could be a list, or even 
another Map ?

>
>
> Thanks,
>
> Denis