obtaining an int[] from Collection<Integer> ?

[Andreas Leitgeb]

Is there any standard-library method, that would take an
Integer[] or Collection<Integer>, and give me an int[] ?
I'd need the int[] for some external interface.

If "do it yourself" is the only answer, then there's no
need to elaborate on that. I do know how to do it myself.
I just wouldn't want to reinvent a wheel.

PS:
It would, of course, generally have to deal with
null-values, but not in my case: it's a null-free
Collection.

 

[Sigfried]

Andreas Leitgeb a écrit :

Is there any standard-library method, that would take an
Integer[] or Collection<Integer>, and give me an int[] ?
I'd need the int[] for some external interface.

not in jdk1.5

 

[Andreas Leitgeb]

Is there any standard-library method, that would take an
Integer[] or Collection<Integer>, and give me an int[] ?
I'd need the int[] for some external interface.

I don't know. Maybe this library could help:
http://commons.apache.org/primitives/

Thanks.
It helped me indirectly: The idea of using special
Collections of primitives, made me look again at
BitSet, and this time I found it suitable for my job.

I still have to construct the int[] manually, but other
parts of my code improved a lot by using a BitSet.
The numbers are expected to be well below 1000 (for
domain-specific reasons), and checking containment,
adding and removing happens much more often than
obtaining that array.

 

[Andreas Leitgeb]

Andreas Leitgeb a écrit :

Is there any standard-library method, that would take an
Integer[] or Collection<Integer>, and give me an int[] ?
I'd need the int[] for some external interface.

not in jdk1.5

The problem itself has dissolved, but out of curiosity:

Does that explicit restriction to 1.5 mean:
"I don't know for other versions"
or does it mean:
"starting with 1.6 there is ..."
?

 

[Sigfried]

Andreas Leitgeb a écrit :

Andreas Leitgeb a écrit :

Is there any standard-library method, that would take an
Integer[] or Collection<Integer>, and give me an int[] ?
I'd need the int[] for some external interface.

not in jdk1.5

The problem itself has dissolved, but out of curiosity:

Does that explicit restriction to 1.5 mean:
"I don't know for other versions"
or does it mean:
"starting with 1.6 there is ..."

"I don't know for other versions"