【Lua】题目小练8
-- 题目 1:定义一个类 Person
-- 属性:name、age,其中 age 默认是 0,不能小于 0。
-- 方法:introduce(),输出 "My name is <name>, I am <age> years old."
-- 要求使用封装思想,age 设置必须通过一个方法 setAge(age),并在方法中处理合法性。
local Person = {} Person.__index = Person--构造函数 function Person:new(name, age)local obj = {name = name or "UnKnow",age = 0,}setmetatable(obj,self)obj:setAge(age)return obj endfunction Person:introduce()print("My name is "..self.name..", I am "..self.age.." years old.") endfunction Person:setAge(age)if (age and type(age) == "number" and age > 0) thenself.age = ageelseprint("[Warning] Invalid age value, defaulting to 0.")end end
-- 题目 2:类中添加私有方法(模拟私有函数)
-- 在 Person 类中,添加一个私有函数 calculateBirthYear(currentYear),根据年龄推算出生年份。
-- 在 introduce() 中调用它,输出内容增加一句:"I was born in <year>."
-- 提示:Lua 本身没有私有函数机制,但可以通过 local 函数模拟。
local function calculateBirthYear(self, currentYear)return currentYear - self.age endfunction Person:introduce()print("My name is "..self.name..", I am "..self.age.." years old.")print("I was born in "..calculateBirthYear(self, 2025)..".") endlocal o = Person:new("Keixo",12) o:introduce()
-- 题目 3:定义子类 Student 继承 Person
-- 除了继承的属性和方法外,还新增属性 school,方法 introduce() 要重写,输出:
-- My name is <name>, I am <age> years old.
-- I study at <school>.
-- 同时添加方法 study(subject),输出:"<name> is studying <subject>."
local Student = {} Student.__index = Student setmetatable(Student, {__index = Person})function Student:new(name, age, school)local obj = Person.new(self, name, age)-- setmetatable(obj, self)obj.school = school or "UnKnow School"return obj endfunction Student:introduce()print("My name is "..self.name..", I am "..self.age.." years old.")print("I study at "..self.school..".") endfunction Student:study(subject)print(self.name.." is studying "..subject..".") endlocal u = Student:new("Z",-2, "nihao") u:introduce() u:study("Math")
-- 题目 4:定义子类 Teacher 继承 Person
-- 属性:subject,
-- 方法:teach() 输出:"<name> is teaching <subject>."
-- 并重写 introduce() 输出:
-- My name is <name>, I am <age> years old.
-- I teach <subject>.
local Teacher = {} Teacher.__index = Teacher setmetatable(Teacher, {__index = Person})function Teacher:new(name, age, subject)local obj = Person.new(self,name, age)obj.subject = subject-- setmetatable(obj, self)return obj endfunction Teacher:teach()print(self.name.."is teaching "..self.subject..".")print("I teach "..self.subject..".") endlocal y = Teacher:new("y", 20, "Math") y:introduce() y:teach()
-- 题目 5:实现一个多态接口 introduceAll
-- 定义一个函数 introduceAll(personList),参数是一个表,内部调用每个人的 introduce() 方法。
-- 传入 Person、Student、Teacher 等不同对象,验证其输出是否符合多态行为。
local function introduceAll(personList)for i, person in ipairs(personList) doperson:introduce()end endlocal people = {Person:new("p",1),Student:new("s",2),Teacher:new("t",3) }introduceAll(people)
-- 题目 6:添加“静态方法”支持
-- 给 Person 添加一个类方法(静态方法)isAdult(age),返回是否大于等于 18 岁。
-- 提示:通过 Person.isAdult = function(age) ... end 实现。
Person.isAdult = function(age)return (type(age) == "number" and age >= 18) and true or false endprint(o.isAdult(9))
-- 题目 7:模拟构造函数重载
-- 修改 Person:new(),支持两种构造方式:
-- Person:new(name, age)
-- Person:new({name = "xx", age = xx})
-- 要求两种方式都能成功创建对象。
function Person:new(nameOrTable, age)local obj = {}if type(nameOrTable) == "table" thenfor i,v in pairs(nameOrTable) doobj[i] = vendelseif type(nameOrTable) == "string" thenobj.name = nameOrTableobj.age = ageendsetmetatable(obj,self)return obj endlocal p = Person:new("p", 12) local k = Person:new({name = "k", age = 12})p:introduce() k:introduce()