/***
 * Excerpted from "Programming Groovy",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/vslg for more book information.
***/
class Equipment
{
  def calculator
  
  Equipment(calc) { calculator = calc }
  
  def simulate()
  {
    println "Running simulation"
    calculator() // You may send parameters as well
  }
}

eq1 = new Equipment() { println "Calculator 1" }

aCalculator = { println "Calculator 2" }

eq2 = new Equipment(aCalculator)
eq3 = new Equipment(aCalculator)

eq1.simulate()
eq2.simulate()
eq3.simulate()