Ruby中的反射（Reflection）应用实例

在Java语言中，提供了发射机制，通过发射机制可以通过字符串构造出这个对象，可以获取对象的所有方法（包括私有方法），可以调用私有方法，可以更改成员变量的值（包括私有的成员变量）。
Ruby也是面向对象的高级语言，当然也提供了反射机制，今天我们讨论通过类名称构造类对象的功能。

一、通过类名称构造类对象

我们先看普通的构造：

module ModuleA

#the class name, later we will use it to create the corresponding object

CLASS_NAME_OF_WOOD = "ModuleA::Wood"

CLASS_NAME_OF_WOODDESK = "ModuleA::WoodDesk"

CLASS_NAME_OF_WOODCHAIR = "ModuleA::WoodChair"

class Wood

def initialize

@desc = "I am a primal wood"

end

def say

puts @desc

end

class WoodDesk < Wood

def initialize

@desc = "I am a desk made of wood"

end

def say_private

puts "actually, i have some bug but no public"

end

public :say

private :say_private

end

class WoodChair < Wood

def initialize

@desc = "I am a chair made of wood"

end

def say_private

puts "I Want get married with a WoodDesk..."

end

def smile

puts "ha hah hah haha ...."

end

public :say

private :say_private, :smile

end