method chain feature for a Java object in JRuby

methodchain.rb

#method chain feature for a Java object in JRuby
class MethodChain
  def initialize(underlying)
    @underlying = underlying
  end
  
  def method_missing(name, *args, &block)
    @underlying.send(name, *args, &block)
    return self
  end
  
  def apply(&block)
    yield self
  end
  
  def get
    return @underlying
  end
end

def example
  require 'java'
  frame = MethodChain.new(JavaxSwing::JFrame.new).
    addKeyListener{|e| JavaLang::System::exit(0) if e.key_code == 033}.
    apply{|f| f.contentPane.add JavaxSwing::JScrollPane.new('abc')}.
    setPreferredSize(JavaAwt::Dimension.new(800,600)).
    pack.
    get
  return frame
end