local class = require 'middleclass'--类的继承
Person = class('Person')  --定义一个Person类
function Person:initialize(name)  --构造函数self.name = name
endfunction Person:speak() --方法print("Hi,i am " ..self.name .. ".")
endAgedPerson = class('AgedPerson',Person) --子类
AgedPerson.static.ADULT_AGE = 18  --类成员function AgedPerson:initialize(name,age)  --子类构造
    Person.initialize(self,name)self.age = age
endfunction AgedPerson:speak()  --子类方法Person.speak(self)   --子类调用父类方法if(self.age < AgedPerson.ADULT_AGE) thenprint("i am underaged")elseprint("i am an adult")end
endlocal p1 = AgedPerson:new('张东升',13) --定义一个子类对象
local p2 = AgedPerson:new('无量',21)
p1:speak()--Mixins 这种特性可以在不同的类之间共享一些函数，
--可以是不同的基类
HasWings =
{fly = function(self)print('flap flap i am a ' .. self.class.name)end
}Animal = class('Animal')  --动物类
Insect = class('Insect',Animal)  --昆虫类
Worm = class('Worm',Insect) --虫子
Bee = class('Bee',Insect) --蜜蜂
Bee:include(HasWings) --增加类成员
Mammal = class('Mammal',Animal) --哺乳动物
Fox = class('Fox',Mammal) --狐狸
Bat = class('Bat',Mammal) --蝙蝠
Bat:include(HasWings) --

local bee = Bee()
local bat = Bat()
bee:fly()
bat:fly()--下在这种方法
DrinksCoffe = {}
function DrinksCoffe:drink(drinkTime)if drinkTime ~= self.class.coffeeTime thenprint(self.name .. ": It is not the time to drink coffee")elseprint(self.name .. ": Mmm I love coffee ad drinkTime")end
endfunction DrinksCoffe:include(klass)print(klass.name .. " drinks coffee at " .. klass.coffeeTime)
endEnglishMan = class('EnglishMan')
EnglishMan.static.coffeeTime = 5
EnglishMan:include(DrinksCoffe)
function EnglishMan:initialize(name) self.name = name endSpaniard = class('Spaniard')
Spaniard.static.coffeeTime = 6
Spaniard:include(DrinksCoffe)
function Spaniard:initialize(name) self.name = name endtom = EnglishMan:new('tom')
juan = Spaniard:new('juan')
tom:drink(5)
juan:drink(5)
juan:drink(6)--为类增加元方法
Point = class('Point')
function Point:initialize(x,y)self.x = xself.y = y
endfunction Point:__tostring()return 'Point:[' .. tostring(self.x) .. ',' .. tostring(self.y) .. ']'
end
p1 = Point(100,200)
print(p1)