Jython Hello World

from javax.swing import JButton, JFrame, JOptionPane

class HelloWorld(JFrame):
    def __init__(self):
        super(HelloWorld, self).__init__("Hello, Jython!")
        self.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
        self.setSize(300, 300)
        button = JButton("Click Me!", actionPerformed=self.clickMeClicked)
        self.add(button)
        self.visible = True
    def clickMeClicked(self, event):
        print "You clicked Click Me!"
        JOptionPane.showMessageDialog(self, "You clicked Click Me!")
if __name__ == "__main__":
    HelloWorld()