Duplicate Keys in a Map !

Hi,

I know that having duplicate keys in a map is not possible, but is there
anything in java that can do such a thing?

example;

key1
- "one"
- "1"
- "uno"

key2
- "two"
- "2"
- "ect"

so by using key2 I can access all the data (return an enumeration ect)
associated with key2.

thanks in advance
lee



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L Clarke

L Clarke wrote:
> Hi,
>
> I know that having duplicate keys in a map is not possible, but is there
> anything in java that can do such a thing?
>
> example;
>
> key1
> - "one"
> - "1"
> - "uno"
>
> key2
> - "two"
> - "2"
> - "ect"
>
> so by using key2 I can access all the data (return an enumeration ect)
> associated with key2.
>
> thanks in advance
> lee
>
>
>
> --
> Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
> ------->>>>>>http://www.NewsDemon.com<<<<<<------
> Unlimited Access, Anonymous Accounts, Uncensored Broadband Access

It is Map of Maps

key="key1", value - another map where keys are "one", "1", "uno",
"один", "ieden", ...

Vova Reznik

L Clarke wrote:
> Hi,
>
> I know that having duplicate keys in a map is not possible, but is there
> anything in java that can do such a thing?
>
> example;
>
> key1
> - "one"
> - "1"
> - "uno"
>
> key2
> - "two"
> - "2"
> - "ect"
>
> so by using key2 I can access all the data (return an enumeration ect)
> associated with key2.
>
> thanks in advance
> lee
>
>
>
> --
> Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
> ------->>>>>>http://www.NewsDemon.com<<<<<<------
> Unlimited Access, Anonymous Accounts, Uncensored Broadband Access
sure... have a map of arrayList objects

Andrew McDonagh

L Clarke wrote:
> Hi,
>
> I know that having duplicate keys in a map is not possible, but is there
> anything in java that can do such a thing?
>
> example;
>
> key1
> - "one"
> - "1"
> - "uno"
>
> key2
> - "two"
> - "2"
> - "ect"
>
> so by using key2 I can access all the data (return an enumeration ect)
> associated with key2.
>
> thanks in advance
> lee


You could have a map where the value is a datastructure that holds an
indeterminate amount of values. Or you could (ab)use a hashmap in ways
no hashmap should be (ab)used.

Scott.R.Lemke@gmail.com

L Clarke wrote:

> I know that having duplicate keys in a map is not possible, but is there
> anything in java that can do such a thing?

http://java.sun.com/docs/books/tutor...faces/map.html

Scroll down to the section on Multimaps.

Jeffrey Schwab

L Clarke wrote:
> I know that having duplicate keys in a map is not possible, but is there
> anything in java that can do such a thing?
>
> example;
>
> key1
> - "one"
> - "1"
> - "uno"
>
> key2
> - "two"
> - "2"
> - "ect"
>
> so by using key2 I can access all the data (return an enumeration ect)
> associated with key2.

Just use an ArrayList as the value in the Hash, then you iterate the AL
when its returned.

/tom

tom fredriksen

On Wed, 22 Feb 2006 20:30:20 -0000, "L Clarke" <>
wrote, quoted or indirectly quoted someone who said :

>I know that having duplicate keys in a map is not possible, but is there
>anything in java that can do such a thing?

sure a HashMap where the value is an array or ArrayList of the
duplicate values. When you discover the dup, you have to manage it
yourself by adding your element to the array/ArrayList/Collection

HashMap just hands you back the list of duplicates.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

Roedy Green

Jeffrey Schwab wrote:
> L Clarke wrote:
>
>> I know that having duplicate keys in a map is not possible, but is
>> there anything in java that can do such a thing?
>
>
> http://java.sun.com/docs/books/tutor...faces/map.html
>
> Scroll down to the section on Multimaps.

They mention it,
jakarta common collections DOES it:

http://jakarta.apache.org/commons/co.../MultiMap.html

BugBear

bugbear