19 lines
705 B
Clojure
19 lines
705 B
Clojure
(ns koans.20-java-interop
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(:require [koan-engine.core :refer :all]))
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(meditations
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"You may have done more with Java than you know"
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(= java.lang.String (class "warfare")) ; hint: try typing (javadoc "warfare") in the REPL
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"The dot signifies easy and direct Java interoperation"
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(= "SELECT * FROM" (.toUpperCase "select * from"))
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"But instance method calls are very different from normal functions"
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(= ["SELECT" "FROM" "WHERE"] (map #(.toUpperCase %) ["select" "from" "where"]))
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"Constructing might be harder than breaking"
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(= 10 (let [latch (java.util.concurrent.CountDownLatch. 10)]
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(.getCount latch)))
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"Static methods are slashing prices!"
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(== 1024 (Math/pow 2 10)))
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