swift类声明、继承

//声明类
class Person {
    var name :String
    var age:Int
    //若声明变量时变量没初始化需要在init中为其初始化，若声明时都已经初始化则不需要提供init
    init(name:String,age:Int) {
        self.age=age
        self.name=name
    }
    
    func getName(def:String) -> String {
        return name
    }
    
    func toString() {
        print("self: "+self.name+" \(self.age)")
    }
    
}

// 实例化类，参数由init决定
var person = Person(name:"xiaoming",age:10)

var name=person.getName(def: "defname")

print(name)

person.name="xiaohong"
name=person.getName(def: "defname")
print(name)


//继承
class Student: Person {
    var stuId:String="00"
    //若重写init则需要显式调用父类init
    init() {
        super.init(name: "defname",age: 10)
    }
    //方法重写
    override func toString() {
        print("self: "+self.stuId+" "+String(self.age)+" "+self.name)
    }
    //析构函数
    deinit {
        print("deinit.....")
    }
}

var stu = Student()
stu.toString()