title: How do I implement a Java interface in Clojure
body: <p>How do I create a Clojure object that implements this interface and then gets called from Java code?</p>
  
  <pre><code>public interface Doer {
     public String doSomethin(String input);
  }
  
  Doer clojureDoer = ?;
  
  String output = clojureDoer.doSomethin(input);
  </code></pre>