2.代码:

-- 加载文件
require "class"

------------------------------
-- 产品
------------------------------
-- 人类
IHuman = class()

function IHuman:Laugh()
	print("IHuman Laugh")
end

function IHuman:Cry()
	print("IHuman Cry")
end

function IHuman:Talk()
	print("IHuman Talk")
end

-- 黄种人
YellowHuman = class(IHuman)

function YellowHuman:Laugh()
	print("黄色人种会哭")
end

function YellowHuman:Cry()
	print("黄色人种会大笑，幸福呀")
end

function YellowHuman:Talk()
	print("黄色人种会说话，一般说的都是双字节")
end

-- 白种人
WhiteHuman = class(IHuman)

function WhiteHuman:Laugh()
	print("白色人种会哭")
end

function WhiteHuman:Cry()
	print("白色人种会大笑，侵略的笑声")
end

function WhiteHuman:Talk()
	print("白色人种会说话，一般都是单字节")
end

-- 黑种人
BlackHuman = class(IHuman)

function BlackHuman:Laugh()
	print("黑人会哭")
end

function BlackHuman:Cry()
	print("黑人会笑")
end

function BlackHuman:Talk()
	print("黑人可以说话，一般人听不懂")
end

---------------
-- 工厂
---------------
IHumanFactory = class()
function IHumanFactory:CreateHuman()
	print("IHumanFactory")
end

-- 创造黄种人工厂类
YellowHumanFactory = class(IHumanFactory)
function YellowHumanFactory:CreateHuman()
	return YellowHuman:new()
end

-- 创造白种人工厂类
WhiteHumanFactory = class(IHumanFactory)
function WhiteHumanFactory:CreateHuman()
	return WhiteHuman:new()
end

-- 创造黑种人工厂类
BlackHumanFactory = class(IHumanFactory)
function BlackHumanFactory:CreateHuman()
	return BlackHuman:new()
end

-- 测试代码
function DoFactoryMethod(factory)
	if factory == nil then return end
	IHuman = factory:CreateHuman()
	IHuman:Cry()
	IHuman:Laugh()
	IHuman:Talk()
end

--- main ---
function main()
	print("----------第一批人是这样的：黄种人工厂来生产黄种人")
	DoFactoryMethod(YellowHumanFactory:new())
	print("----------第二批人是这样的：白种人工厂来生产白种人")
	DoFactoryMethod(WhiteHumanFactory:new())
	print("----------第一批人是这样的：黑种人工厂来生产黑种人")
	DoFactoryMethod(BlackHumanFactory:new())
end

main()