Source code in the frege programming language

package HelloWorldGraphical where

import Java.Swing

main _ = do
    frame <- JFrame.new "Goodbye, world!"
    frame.setDefaultCloseOperation(JFrame.dispose_on_close)
    label <- JLabel.new "Goodbye, world!"
    cp <- frame.getContentPane
    cp.add label
    frame.pack
    frame.setVisible true