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Homephp教程php手册PHP中用接口、抽象类、普通基类实现“面向接口编程”与“耦合方法”简述

复制代码 代码如下:


/*
边学边做的,为方便自己翻阅而发布,更为得到高人指点而发布,欢迎高手指点......
【提示】本例通过测试无误
【情景设计】
模拟计算机主板IDE接口,比如:主板可以存取的储存器常常有光驱、硬盘、闪存等等,
为了方便,有必要对这些不同的储存器设定同一的接口。
本例还假设一种前所未有的、存取方式与众不同的外星储存器也要加到主板上进行存取,
于是需要采用耦合的设计模式。
【本例主要讲述】
1、通过接口、抽象类、一般类继承三种方式达到所谓的“接口”模式,以此说明:
A、子类对象可以当父类对象用,因为子类是特殊的父类!
B、请注意这三种实现方式中接口、抽象类和一般类继承的基类写法!
2、接口模式真的是一纸契约!
3、程序设计之"耦合设计模式"!
*/
//----------------------------------------------------------------------
/*【方式一】接口实现方式:*/
interface readandwrite{
function read();
function write();
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this->storage->read();
}
function write(){
$this->storage->write();
}
}
class flash implements readandwrite{
function __construct(){
echo "我是闪存:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......


";
}
}
class yingpan implements readandwrite{
function __construct(){
echo "我是硬盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
class disco implements readandwrite{
function __construct(){
echo "我是光盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
//----------------------------------------------------------------------
/*【方式二】抽象类实现方式:
abstract class readandwrite{
abstract function read();
abstract function write();
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this->storage->read();
}
function write(){
$this->storage->write();
}
}
class flash extends readandwrite{
function __construct(){
echo "我是闪存:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
class yingpan extends readandwrite{
function __construct(){
echo "我是硬盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
class disco extends readandwrite{
function __construct(){
echo "我是光盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
*/
//----------------------------------------------------------------------
//【方式三】一般类继承实现方式:
/*
class readandwrite{
function read(){
echo "reading..............";
}
function write(){
echo "writing..............";
}
}
class motherboard{
private $storage;
function __construct(readandwrite $obj){
$this->storage=$obj;
}
function read(){
$this->storage->read();
}
function write(){
$this->storage->write();
}
}
class flash extends readandwrite{
function __construct(){
echo "我是闪存:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
class yingpan extends readandwrite{
function __construct(){
echo "我是硬盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
class disco extends readandwrite{
function __construct(){
echo "我是光盘:
";
}
function read(){
echo "开始读取数据......
";
}
function write(){
echo "开始储存数据......
";
}
}
*/
//----------------------------------------------------------------------
/*
【耦合模式】
耦合模式就是将不同标准的两个类(本例的接口、抽象类、普通基类与外星储存器有不同的存取方法),
通过中间转换器,达到同一标准的目的,就像转接线一样——本例就是将unknow类的Rdata、Wdata方法转
换成read、write方法,达到和本例的接口、抽象类、普通基类相同的存取方法, 本例的中间转换器是
Apdater类。
由于php中只能继承一个类但可以继承多个接口,所以产生了三种耦合方法:
方法一:中间转换器Apdater类继承抽象类或普通基类,但由于php中只能继承一个类,所以在Apdater
类中定义一个外星存储器类unknow的对象,并用重载继承的抽象类或普通基类的存取方法的方式来转
换存取方法,达到同一存取方法的目的。
方法二:中间转换器Apdater类继承外星存储器类unknow、接口,此时可以直接用Apdater类的存取方法
(parent::Rdata()与parent::Wdata()——php中子类调用父类方法的方式),和实现接口规定方法,
来转换存取方法,达到同一存取方法的目的。
方法三:与方法一雷同,只是改为继承(实现)接口;
*/
//----------------------------------------------------------------------
/*
【方法一】
*/
/*
class unknow{
function __construct(){
echo "我是地球人未知的外星储存器,我有不同于地球储存器的存取方式:
";
}
function Rdata(){
echo "I'm reading now......
";
}
function Wdata(){
echo "I'm writing now......
";
}
}
class Adpater extends readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj=$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
*/
//----------------------------------------------------------------------
/*
【方法二】
class unknow{
function __construct(){
echo "我是地球人未知的外星储存器,我有不同于地球储存器的存取方式:
";
}
function Rdata(){
echo "I'm reading now......
";
}
function Wdata(){
echo "I'm writing now......
";
}
}
class Adpater extends unknow implements readandwrite{
function read(){
parent::Rdata();
}
function write(){
parent::Wdata();
}
}
*/
//------------------------------------------------------------------------
/*
【方法三】
*/
class unknow{
function __construct(){
echo "我是地球人未知的外星储存器,我有不同于地球储存器的存取方式:
";
}
function Rdata(){
echo "I'm reading now......
";
}
function Wdata(){
echo "I'm writing now......
";
}
}
class Adpater implements readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj=$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
//【程序主体调用】
echo "面向对象程序设计——接口
";
$storage1=new flash();
$computer=new motherboard($storage1);
$computer->read();
$computer->write();
$storage2=new yingpan();
$computer=new motherboard($storage2);
$computer->read();
$computer->write();
$storage3=new disco();
$computer=new motherboard($storage3);
$computer->read();
$computer->write();
$un_storage=new unknow();
$apdaterx=new Adpater($un_storage);
$computer=new motherboard($apdaterx);
$computer->read();
$computer->write();
?>
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