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require 'java'

import 'javax.swing.JFrame'
import 'javax.swing.JLabel'
import 'javax.swing.SwingUtilities'
import 'java.lang.Runnable'

class SwingDemo
  def initialize
    jfrm = JFrame.new "A Simple Demo"
    jfrm.setSize(275,100)
    jfrm.default_close_operation = JFrame::EXIT_ON_CLOSE
    jlab = JLabel.new " Swing powers the modern Java GUI"
    jfrm.add jlab
    jfrm.pack
    jfrm.visible = true
  end
end

class RunnableProc
  include Runnable
  def initialize(&block)
    @block = block
  end

  def run
    @block.call
  end
end

class Proc
  def to_runnable
    RunnableProc.new &self
  end
end

SwingUtilities.invoke_later(proc { SwingDemo.new }.to_runnable)