#!/usr/bin/ruby -w

# 定義類
class Box
   # constructor method
   def initialize(w,h)
      @width, @height = w, h
   end
   # 實(shí)例方法
   def getArea
      @width * @height
   end
end

# 創(chuàng)建對(duì)象
box = Box.new(10, 20)

# 調(diào)用實(shí)例方法
a = box.getArea()
puts "Area of the box is : #{a}"