# This is the 'magical Java include line'.
include Java

# With the 'include Java' above, we can now refer to things that
#are part of the standard Java platform via their full paths.
# Creating a Java JFrame.
frame = javax.swing.JFrame.new("Window")
label = javax.swing.JLabel.new("Hello")

# We can transparently call Java methods on Java objects, just
# as if they were defined in Ruby.
frame.getContentPane.add(label)  # Invoking the getContentPane
frame.setDefaultCloseOperation(
  javax.swing.JFrame::EXIT_ON_CLOSE)
frame.pack
frame.setVisible(true)