A few questions about "hello world" in clojure

Question

I have a couple of questions about Hello World in Clojure:

(println "Hello, world!")

• Since 'println' is used, does this mean that some Java libraries are included by default in the default namespace, as in Grails?

• Why do you need parentheses around the statement? Judging by other examples (below), brackets are common:

  (let [i (atom 0)] (defn generate-unique-id "Returns a separate digital identifier for each call." [] (swap! i inc)))

• Any evidence so far that Clojure is likely to be caught?

Answer 1

• println - Clojure, , Java ( ). Java (java.io java.lang, ).

• Lisp. , Java:

  addTwoNumbers(4, 5);
  

  Clojure ( Lisp):

  (addTwoNumbers 4 5)
  

• Clojure . Google