sort_performance.rb

# coding: utf-8

include Java

class DataSet

  def random scale
    if !@random_array
      @random_array = scale.times.map do
        rand 1..scale
      end
    end
    @random_array
  end

  def identical scale
    [1] * scale
  end

  def asc scale
    ( 1..scale ).to_a
  end

  def desc scale
    asc(scale).reverse
  end

end

class SortPerformance
end

data = DataSet.new
scale = 6000000

t1 = java.lang.System.nanoTime
ar = data.random scale
t2 = java.lang.System.nanoTime

puts "#{ t2 - t1 } nano seconds for generating #{ scale } elements' array."