ruby 绕过private方法的限制，直接调用private方法

#encoding : utf-8class Cat  private  def eat    puts '我是私有方法'  endend#方法一cat = Cat.new#cat.send('eat')cat.send(:eat)#方法二cat.instance_eval do  eat()end#方法三class Pcat < Cat  def eat    super  endendp = Pcat.newp.eat()