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include Java

import java.awt.event.ActionListener
import javax.swing.JButton
import javax.swing.JFrame

class JButton
  def action_performed(&block)
    add_action_listener(ActionListener.impl {|sym, *args| block.call(args[0]) })
  end
end

button = JButton.new("hello")
frame = JFrame.new("frame")
frame.set_size(200,200)
frame.add button
frame.show

button.action_performed {|event| event.source.text = 'goodbye'}