12Working with the JVM

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There comes a day in every Clojurist’s life when she must venture forth from the sanctuary of pure functions and immutable data structures into the wild, barbaric Land of Java. This treacherous journey is necessary because Clojure is hosted on the Java Virtual Machine (JVM), which grants it three fundamental characteristics. First, you run Clojure applications the same way you run Java applications. Second, you need to use Java objects for core functionality like reading files and working with dates. Third, Java has a vast ecosystem of useful libraries, and you’ll need to know a bit about Java to use them.

In this way, Clojure ...

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