(import '(javax.swing JFrame JLabel JTextField JButton)
        '(java.awt.event ActionListener)
        '(java.awt GridLayout))
(let [frame (new JFrame "My Frame")
      my-button (new JButton "Press me!")]
    (. my-button
        (addActionListener
           (proxy [ActionListener] []
                (actionPerformed [evt]
                     (setText " Fahrenheit")))))
    (doto frame
                (setLayout (new GridLayout 2 2 3 3))
                (add my-button)
                (setSize 300 80)
                (setVisible true)))