Lua的类有点像javascript,但是更简明灵活，table即对象，对象就是类。Metatables比起ruby里的MetaClass更加好用，缺点是实例化和继承的代码有点多，
不像ruby里的“<”和“<<”,继承链就是查找方法时的方法链。
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Account={
test1=function(a) print("Account test1") end
}
Account.test2=function(a) print("Account test2") end
function Account.test3(a) print("Account test3") end
function Account:new (o) --类的实例化
o = o or {}
setmetatable(o, self)
self.__index = self
return o
end
function Account.print0(o,a)
print(a)
end
function Account:print1(a)
print(a)
end
--方法定义测试
Account.test1()
Account.test2()
Account.test3()
--类测试
acc=Account:new()
acc.test1()
acc.print0(acc,"dot print0")
acc:print0("not dot print0")
acc.print1(acc,"dot print1")
acc:print1("not dot print1")
acc.specialMethod=function(specialMethodTest)
print(specialMethodTest)
end
acc.specialMethod("smt test")
--继承测试
SpecialAccount = Account:new()
s = SpecialAccount:new{limit=1000.00}
--多重继承测试
Named = {}
function Named:getname ()
return self.name
end
function Named:setname (n)
self.name = n
end
local function search (k, plist)
for i=1, table.getn(plist) do
local v = plist[i][k]
if v then return v end
end
end
function createClass (...)
local c = {} -- new class
setmetatable(c, {__index = function (t, k)
return search(k, arg)
end})
c.__index = c
function c:new (o)
o = o or {}
setmetatable(o, c)
return o
end
return c
end
NamedAccount = createClass(Account, Named)
account = NamedAccount:new{name = "Paul"}
print(account:getname())
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