Swift 面向对象

import Foundation

class Hi{
    func sayHi(){
        print("HI jinpanpang")
    }
}

class  Hello:Hi {
    var _name:String
    
    // 有参构造函数
    init(name:String) {
        self._name = name
        print("init hello")
    }
    
    // 重写父类方法
    override func sayHi() {
        print("override \(self._name)")
    }
}

var hi = Hi()
hi.sayHi();

var h = Hello(name: "zhangsan")
h.sayHi();

/* 输出结果
HI jinpanpang
init hello
override zhangsan
Program ended with exit code: 0
*/