慕田峪0738999
2018-06-27 22:07:55浏览 1085
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title></head><body><?php/*class Ren{ public $name; function Say() { echo $this->name."正在讲话"; }}class China extends Ren{ //子类对父类的方法进行重写 function Say() { parent::Say(); echo "你好"; } function Run() { echo $this->name."正在跑步"; }}class America extends Ren{ //子类对父类的方法进行重写 function Say() { echo "hello"; }}*//*$c = new China();$c->Say();$a = new America();$a->Say();var_dump($c);*///overload 重载//可以使类里面的某个方法产生多种效果，根据传入的参数不同，可以执行不同的逻辑//也是多态的一种，编译多态 /* class Test { public string show() { return "0参"; } public string show(string s) { return "1参"; } public string show(string s,string a) { return "2参"; } } Test t = new Test(); t.show("a","b");*///父类 /* class Ren { public virtual string Say() { return "说话"; } } //子类 class China : Ren { public override string Say() { return "你好"; } } //子类 class America : Ren { public override string Say() { return "hello"; } } //父类引用r指向子类实例 Ren r = new America(); MessageBox.Show(r.Say()); r = new China(); MessageBox.Show(r.Say()); //子类的对象可以代替父类的对象 America a = new America(); MessageBox.Show(Eat(a)); //怪兽吃人，需要一个人的参数 public string Eat(Ren r) { return "这个人味道不错！"; }*/?></body></html>