this post was submitted on 21 Oct 2023
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How do i use an arraylist in kawa scheme ? (alien.top)
submitted 1 year ago by Ok_Specific_7749@alien.top to c/lisp
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cfr https://www.geeksforgeeks.org/arraylist-in-java/

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[–] Ok_Specific_7749@alien.top 1 points 1 year ago

Program :


(module-name MyTest)
(module-compile-options main: #t)

(define (main)
    (define ar ::java.util.ArrayList[symbol] (java.util.ArrayList))
    (ar:add 'a)
    (ar:size)
    (ar:add 1))
(main)

Error:


(compiling ./MyTest.scm to MyTest)
./MyTest.scm:9:13: warning - type integer is incompatible with required type symbol
./MyTest.scm:9:5: warning - cannot convert literal (of type gnu.math.IntNum) to ClassType gnu.mapping.Symbol
        0,32 real         0,53 user         0,07 sys
java.lang.ClassCastException: class gnu.math.IntNum cannot be cast to class gnu.mapping.Symbol (gnu.math.IntNum and gnu.mapping.Symbol are in unnamed module of loader 'app')
	at MyTest.main(MyTest.scm:9)
	at MyTest.run(MyTest.scm:5)

µ