我有一个字符串'Question'，如何获取类Question的实例

Question

class_name = 'Question'
instance = which_method(class_name)

我应该使用哪种方法？

Answer 1

class_name = 'Question'
klass = Kernel.const_get class_name # klass holds the class Question, which is an object
instance = klass.new