Clojure :: (String/format "%s" "a") :: fails with ClassCastException

Question

The following call:

(String/format "%s" "a")

... throws a "ClassCastException java.lang.String cannot be cast to [Ljava.lang.Object" exception in Clojure.

(String/format "%s" (cast Object "a"))

.... produces the same exception.

Answer 1

Because last argument in java API is array Object[] instead of Object.

Just call (String/format "%s" (into-array ["a"]))

But more idiomatic to use (format "Hello %s" "world")