Re: JavaCode with static class methods

[Thorsten Jolitz]

Alexander Burger  writes:

Hi Joe, Hi Alex,

>> I'm experimenting a bit with the 'java' function, and the StringBuilder
>> ...
>> (java "java.lang.Math" 'sqrt 4)
>
> It needs a different call:

>: (java "java.lang.Math" 'sqrt  (-6 . 64.0))

thanks for the hints, so actually I was pretty close, just ignorant
about the peculiarities of those numeric arguments.

-- 
cheers,
Thorsten

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Re: JavaCode with static class methods

[Alexander Burger]

Hi Thorsten,

> I'm experimenting a bit with the 'java' function, and the StringBuilder
> ...
> (java "java.lang.Math" 'sqrt 4)

It needs a different call:

   : (scl 6)
   -> 6

   : (java "java.lang.Math" 'sqrt  (-6 . 64.0))
   -> 800

   : (round @)
   -> "8.000"

As you probably know, the Java interface is described in
http://picolisp.com/wiki/?javacode

It writes:

   While integers are directly passed to/from the JVM, other number formats can
   be passed to the JVM as cons pairs consisting of an ID in the CAR and the
   value in the CDR. These are:

• 1 for Byte
• 2 for Char
• 3 for Short
• 4 for Integer (default, usually not needed)
• 8 for Long
• 9 for BigInteger

   If the CAR is a negative number, the value is taken as a double scaled by the
   negated number of digits.

♪♫ Alex
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Re: JavaCode with static class methods

[Joe Bogner]

Hi Thorsen, it looks like you were on the right path. I'm guessing there
may be a bug or issue with the double signature

This works:

: (java (java "java.lang.Math" "abs" -4))
-> 4

: (java (java "java.lang.Math" "min" 10 5))
-> 5

But I'm just guessing

On Thu, Mar 2, 2017 at 3:02 PM, Thorsten Jolitz <tjol...@gmail.com> wrote:

>
> Hi List,
>
> I'm experimenting a bit with the 'java' function, and the StringBuilder
> and GregorianCalendar example from the JavaCode Wiki entry work fine,
> but I wonder how to use a constructorless class like e.g. java.lang.Math
> with its static class methods?
>
> #+NAME: JavaCode - none of these work
> #+BEGIN_SRC picolisp
> (java "java.lang.Math" 'sqrt 4)
> (java java.lang.Math 'sqrt 4)
> (java 'java.lang.Math 'sqrt 4)
>
> (setq M (java "java.lang.Math" T))  // returns null, no constructor
> #+END_SRC
>
> Thanks for any hints.
>
> --
> cheers,
> Thorsten
>
> --
> UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
>

JavaCode with static class methods

[Thorsten Jolitz]

Hi List, 

I'm experimenting a bit with the 'java' function, and the StringBuilder
and GregorianCalendar example from the JavaCode Wiki entry work fine,
but I wonder how to use a constructorless class like e.g. java.lang.Math
with its static class methods?

#+NAME: JavaCode - none of these work
#+BEGIN_SRC picolisp
(java "java.lang.Math" 'sqrt 4)
(java java.lang.Math 'sqrt 4)
(java 'java.lang.Math 'sqrt 4)

(setq M (java "java.lang.Math" T))  // returns null, no constructor
#+END_SRC

Thanks for any hints.

-- 
cheers,
Thorsten

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