Good to know, thanks. On Tuesday, January 26, 2016 at 5:11:48 PM UTC-6, Gary Trakhman wrote: > > Just because no else has said it yet, clojure vectors, lists and seqs all > implement the read part of the interface java.util.List, and your java API > should most likely be refactored to use the List interface instead of > ArrayList if it isn't already. > > If that's the case, and it's not trying to mutate what's passed in (any > well-designed java api should only read from collections or defensively > copy first), you can just pass the clojure collection to the java api as is. > > On Tue, Jan 26, 2016 at 5:58 PM Beau Fabry <imf...@gmail.com <javascript:>> > wrote: > >> Tell the compiler that the type you're passing to the constructor is a >> Collection, so it will know which constructor to use without reflection. >> >> (set! *warn-on-reflection* true) >> => true >> (import '(java.util ArrayList Collection)) >> => java.util.Collection >> (ArrayList. (list 1 2)) >> Reflection warning, >> /Users/bfabry/Library/Caches/IdeaIC15/tmp/form-init108635367050123227.clj:1:1 >> >> - call to java.util.ArrayList ctor can't be resolved. >> => [1 2] >> (ArrayList. ^Collection (list 1 2)) >> => [1 2] >> >> >> >> On Tuesday, January 26, 2016 at 1:56:19 PM UTC-8, Ritchie Cai wrote: >>> >>> Quoting for small example like I mention is not an issue, but in >>> general, I need to pass an vector or list, since that's what I get, in >>> which case I cannot quote. >>> >>> On Tuesday, January 26, 2016 at 3:52:17 PM UTC-6, Michael Willis wrote: >>>> >>>> What's not practical about quoting? I thought it was considered more >>>> idiomatic than doing (list ...) >>>> >>>> On Sunday, January 17, 2016 at 2:48:29 PM UTC-6, Ritchie Cai wrote: >>>>> >>>>> Hi all, >>>>> >>>>> I'm trying to create a Java ArrayList object from a Clojure collection >>>>> to pass to another Java API. I get reflection warnings when the elements >>>>> are not primitive types, in this case I'm using SparseIndexedVector >>>>> class from vectorz library. >>>>> >>>>> (ArrayList. [c0 c1 c2]) >>>>> Reflection warning, *cider-repl localhost*:77:11 - call to >>>>> java.util.ArrayList ctor can't be resolved. >>>>> >>>>> where c0 c1 c2 are of type SparseIndexedVector. Alternatively, I can >>>>> create create ArrayList then add elements one by one in a loop. >>>>> >>>>> (doto (ArrayList.) >>>>> (.add c0) >>>>> (.add c1) >>>>> (.add c2)) >>>>> >>>>> But I'm wondering if there is away to get rid of the the reflection >>>>> warning when calling ArrayList constructor. >>>>> >>>>> Also, quoting a list will not give reflection warning: >>>>> >>>>> (ArrayList. '(c0 c1 c2)) ;; no warning >>>>> >>>>> (ArrayList. (list c0 c1 c2)) >>>>> Reflection warning, *cider-repl localhost*:77:11 - call to >>>>> java.util.ArrayList ctor can't be resolved. >>>>> >>>>> However, quoting is not very practical. >>>>> >>>>> Thanks >>>>> Ritchie >>>>> >>>>> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com >> <javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> >
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