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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
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<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！";
}
*/
?>
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