<?php
//----------------------------------------------------------------------
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 " I am flash memory: <br>";
}
function read(){
echo " Start reading ......<br>";
}
function write(){
echo " Start storing data ......<hr>";
}
}
class yingpan implements readandwrite{
function __construct(){
echo " I am a hard drive: <br>";
}
function read(){
echo " Start reading ......<br>";
}
function write(){
echo " Start storing data ......<hr>";
}
}
class disco implements readandwrite{
function __construct(){
echo " I am CD: <br>";
}
function read(){
echo " Start reading ......<br>";
}
function write(){
echo " Start storing data ......<hr>";
}
}
//----------------------------------------------------------------------
//----------------------------------------------------------------------
//[mode 3] general class inheritance implementation mode:
//----------------------------------------------------------------------
//----------------------------------------------------------------------
/*
class unknow{
function __construct(){
echo "<font color=#ff0000> I am an alien memory unknown to earthmen, and I have access methods different from those of earth: </font><br>";
}
function Rdata(){
echo "I'm reading now......<br>";
}
function Wdata(){
echo "I'm writing now......<hr>";
}
}
class Adpater extends readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj=$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
*/
//----------------------------------------------------------------------
/*
[method 2]
class unknow{
function __construct(){
echo "<font color=#ff0000> I am an alien memory unknown to earthmen, and I have access methods different from those of earth: </font><br>";
}
function Rdata(){
echo "I'm reading now......<br>";
}
function Wdata(){
echo "I'm writing now......<hr>";
}
}
class Adpater extends unknow implements readandwrite{
function read(){
parent::Rdata();
}
function write(){
parent::Wdata();
}
}
*/
//------------------------------------------------------------------------
class unknow{
function __construct(){
echo "<font color=#ff0000> I am an alien memory unknown to earthmen, and I have access methods different from those of earth: </font><br>";
}
function Rdata(){
echo "I'm reading now......<br>";
}
function Wdata(){
echo "I'm writing now......<hr>";
}
}
class Adpater implements readandwrite{
private $obj;
function __construct(unknow $x){
$this->obj=$x;
}
function read(){
$this->obj->Rdata();
}
function write(){
$this->obj->Wdata();
}
}
//[program body call]
echo "<strong><font color=#990000 size=20px> Object-oriented programming -- interfaces </font></strong><hr>";
$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();
?>