javax.swingのHello WorldをClojureで書く ref: http://qiita.com/iku000888/items/374cc1027bb833748391

file0.java

package start;

/*
 * HelloWorldSwing.java requires no other files. 
 */
import javax.swing.*;        

public class HelloWorldSwing {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

file1.cljs

(ns start.core
  (:import [javax.swing JFrame JLabel SwingUtilities]))

(defn start []
  (let [frame (JFrame. "HelloWorldSwing")
        label (JLabel. "Hello World")]
    (-> frame .getContentPane (.add label))
    (doto frame (.setDefaultCloseOperation JFrame/DISPOSE_ON_CLOSE) .pack (.setVisible true))))