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#!/usr/bin/ruby -w
# 定义类
class Box
   # 构造器方法
   def initialize(w,h)
      @width, @height = w, h
   end
   # 实例方法
   def getArea
      @width * @height
   end
end
# 定义子类
class BigBox < Box
   # 改变已有的 getArea 方法
   def getArea
      @area = @width * @height
      puts "Big box area is : #@area"
   end
end
# 创建对象
box = BigBox.new(10, 20)
# 使用重载的方法输出面积
box.getArea()
 
 
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