swift 基础练习类重写

Swift面向对象编程实践

最新推荐文章于 2025-06-29 10:57:25 发布

原创最新推荐文章于 2025-06-29 10:57:25 发布 · 196 阅读

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CC 4.0 BY-SA版权

本文通过Swift语言实现了一个包含Person、Teacher和Student类的简单面向对象编程案例，演示了继承、覆盖、属性观察器、延迟加载变量、初始化方法、析构函数等概念。

class Person {
    
    func run() {
        
        print("向前全速奔跑")
    }
}

let per = Person()
per.run()

class Teacher: Person {
    
    func teach() {
        
        print("上课要迟到了")
        
        super.run()
    }
}

let tea = Teacher()
tea.teach()

class Student: Person {
    
    var name:String = "小明"{
        
        willSet(new){
            
            print("新的名字：\(new)")
        }
        didSet{
            print("旧的名字：\(oldValue)")
        }
    }
    
    override func run() {
        print("体育课上跑了800米")
    }
    
    var height:String{
        
        return "175cm"
    }
    
    lazy var age:String = "18岁"
    
    init(name:String,age:String) {
        
        super.init()
        
        self.name = name
        self.age = age
    }
    
   public func show() {
        
        print("姓名：\(name),年龄：\(age),身高：\(height)")
    }
    
    deinit {
        self.name = ""
        self.age = ""
        print("调用了析构函数")
    }
    
}

var stu:Student? = Student(name: "小王", age: "20岁")
stu!.name = "小刚"
//stu.name = "小王"
stu!.run()
print(stu!.height)
stu!.show()

stu = nil