Also you can substitute #^"[C" with the more legible #^chars.

On Oct 28, 7:27 pm, Alex Osborne <a...@meshy.org> wrote:
> Chick Corea wrote:
> > What is wrong with this code?  I want to instantiate a Java String
> > from a Java character-array.
> > But I want it to be fast, hence the need to cast per the "warn on
> > reflection" message.
>
> >     user=> (set! *warn-on-reflection* true)
> >     true
> >     user=>  (new String #^"[C" (make-array Character/TYPE 3 \a ))
> >     java.lang.ClassCastException: [[C cannot be cast to [C
> > (NO_SOURCE_FILE:0)
>
> Note the exception, "[[C" means a two-dimensional arary.  (make-array
> Character/TYPE 3 \a) actually means (make-array Character/TYPE 3 97) so
> a 3 by 97 two-dimensional array (new char[3][97] in java syntax).  What
> you probably want is:
>
> user> (String. #^"[C" (into-array Character/TYPE (repeat 3 \a)))
> "aaa"
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