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(let [^java.io.File f (java.io.File/createTempFile "foo" "data")]
  f)
;; => #object[java.io.File 0x1a673be3 "/tmp/foo4723865836546815890data"]
;; => #object[java.io.File 0x23d34b20 "/tmp/foo4573762549041150149data"]

;; ↑だと微妙っぽい
;; https://www.jpcert.or.jp/java-rules/fio03-j.html