Re: Going from Scheme list to Java array

[spellcard199 <spellcard199@protonmail.com>]

Hello. I tried looking it up (just out of curiosity) and it seems that
the method...

>    candidate: Type java.lang.Object[] java.util.List.toArray(ClassType
> java.util.function.IntFunction<null>)

... has been added between Java 8 and Java 11:

- https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html
- https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html

How I found it: I used my Java IDE's "jump to definition" from a Java
project that has Kawa's Java API as a dependency, with the cursor over
".toArray":

  gnu.lists.LList l = gnu.lists.LList.makeList(new ArrayList());
  java.util.function.IntFunction f = (int x) -> null;
  l.toArray(f);


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, June 23, 2020 2:02 AM, Per Bothner <per@bothner.com> wrote:

> On 6/22/20 9:26 AM, Duncan Mak via Kawa wrote:
>
> > (define (into-array l ::java.util.List array-type)
> > (let* ((size (length l))
> > (array ((primitive-array-new array-type) size)))
> > (l:toArray array)))
> > (display (into-array (list 1 2 3) <int>))
> > When I run this in Kawa 3.1.1, this is what I see:
> > foo.scm:4:5: warning - more than one possibly applicable method 'toArray'
> > in java.util.List
> > candidate: Type java.lang.Object[] java.util.List.toArray(ClassType
> > java.util.function.IntFunction<null>)
> > candidate: Type java.lang.Object[]
> > java.util.List.toArray(java.lang.Object[])
>
> Not sure what is going on here. When I use Java 8, there is no problem.
> When I use Java 14, I get the same error. So it seems like something
> got added (after Java got default interface methods). However, I don't see
> it in the documentation here:
> https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/util/List.html
>
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>     --Per Bothner
>
>
> per@bothner.com http://per.bothner.com/