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Editorial Team
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Asked: 2026-05-16T05:36:14+00:00

I can use (.toUpperCase GOOD) in clojure, as GOOD is java string, and java

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I can use (.toUpperCase “GOOD”) in clojure, as “GOOD” is java string, and java string has toUpperCase method.

I also can use (java.io.File/separator) from clojure as a way of calling java functions.

But, why can’t I call (java.lang/Object wait 3) or (java.lang.System/println “hi”)?

  • Can’t we use all the java functions from Clojure?
  • If not, is there any rule for calling them? If so, where are the reference for those functions?
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1 Answer

  1. Editorial Team

    You can use all Java functions from Clojure. See the great page on Clojure’s Java interop.

    In particular, you just need to get the syntax right depending on exectly what sort of Java construct you are dealing with, e.g. executing the println method on the static member “out” from java.lang.System:

    (.println (System/out) "hi")
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