用php来实现书中的示例和习题，昨天完成策略模式和观察者模式，代码如下：
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<?php
interface FlyBehavior
{
function fly();
}
interface QuackBehavior
{
function quack();
}
class FlyWithWings implements FlyBehavior
{
public function fly()
{
print("fly with wings\n");
}
}
class FlyNoWay implements FlyBehavior
{
public function fly()
{
print("fly no way\n");
}
}
class Quack implements QuackBehavior
{
public function quack()
{
print("quack,gua,gua\n");
}
}
abstract class Duck
{
protected $flyBehavior = null;
protected $quackBehaviro = null;
public function __construct(FlyBehavior flyBehavior=null,QuackBehaviorquackBehavior = null)
{
this−>setFlyBehavior(flyBehavior);
this−>setQuackBehavior(quackBehavior);
}
public function fly()
{
$this->flyBehavior->fly();
}
public function quack()
{
$this->quackBehavior->quack();
}
public function getFlyBehavior()
{
return $flyBehavior;
}
public function setFlyBehavior(FlyBehavior $fly)
{
this−>flyBehavior=fly;
}
public function getQuackBehavior()
{
return $quackBehavior;
}
public function setQuackBehavior(QuackBehavior $quack)
{
this−>quackBehavior=quack;
}
abstract public function display();
}
class RedheadDuck extends Duck
{
public function __construct(FlyBehavior flyBehavior=null,QuackBehaviorquackBehavior = null)
{
parent::__construct(flyBehavior,quackBehavior);
}
public function display()
{
print("damn it! RedheadDuck display()\n");
}
}
$duck = new RedheadDuck();
$duck->setFlyBehavior(new FlyWithWings());
$duck->setQuackBehavior(new Quack());
$duck->fly();
$duck->quack();
$duck->display();
?>
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<?php
abstract class Character
{
protected $weapon = null;
public function __construct(WeaponBehavior $weapon = null)
{
this−>setWeapon(weapon);
}
public function setWeapon(WeaponBehavior $weapon)
{
this−>weapon=weapon;
}
public function getWeapon()
{
return $this->weapon;
}
public function useWeapon()
{
$this->weapon->useWeapon();
}
}
class Knight extends Character
{
}
class Queen extends Character
{
}
interface WeaponBehavior
{
function useWeapon();
}
class KnifeWeapon implements WeaponBehavior
{
public function useWeapon()
{
print("Knife used\n");
}
}
$man = new Knight();
$man->setWeapon(new KnifeWeapon());
$man->useWeapon();
?>
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<?php
interface Observable
{
function addObserver(Observer $observer);
function removeObserver(Observer $observer);
function notifyServers();
}
interface Observer
{
function update(WeatherData $weatherData);
}
class WeatherData implements Observable
{
private $observers = array();
private $temperature = 0;
private $humidity = 0;
private $pressure = 0;
public function getTemperature()
{
return $this->temperature;
}
public function setTemperature($temp)
{
this−>temperature=temp;
}
public function getHumidity()
{
return $this->humidity;
}
public function setHumidity($humidity)
{
this−>humidity=humidity;
}
public function getPressure()
{
return $this->pressure;
}
public function setPressure($pressure)
{
this−>pressure=pressure;
}
public function setMeasurements(temperature,humidity, $pressure)
{
this−>setTemperature(temperature);
this−>setHumidity(humidity);
this−>setPressure(pressure);
$this->measureChanged();
}
public function measureChanged()
{
$this->notifyServers();
}
public function addObserver(Observer $observer)
{
this−>observers[]=observer;
}
public function removeObserver(Observer $observer)
{
$result = array();
foreach (this−>observersasobj) {
if (obj!==observer) {
result[]=obj;
}
}
unset($this->observers);
this−>observers=result;
}
public function notifyServers()
{
foreach (this−>observersasobserver) {
observer−>update(this);
}
}
public function getObservers()
{
return $this->observers;
}
}
interface Displayable
{
function display();
}
abstract class BaseDisplay implements Observer, Displayable
{
private $weatherData = null;
public function __construct(Observable $weatherData = null)
{
this−>weatherData=weatherData;
if ($weatherData != null) {
this−>weatherData−>addObserver(this);
}
}
public function update(WeatherData $weatherData)
{
}
public function display()
{
}
}
class CurrentConditionDisplay extends BaseDisplay
{
private $weatherData = null;
private $temperature = 0;
private $humidity = 0;
private $pressure = 0;
public function __construct(Observable $weatherData = null)
{
this−>weatherData=weatherData;
if ($weatherData != null) {
this−>weatherData−>addObserver(this);
}
}
public function update(WeatherData $weatherData)
{
this−>temperature=weatherData->getTemperature();
this−>humidity=weatherData->getHumidity();
this−>pressure=weatherData->getPressure();
$this->display();
}
public function display()
{
print("temp: " . this−>temperature.",humi:".this->humidity . ", pressure: " . $this->pressure . "\n");
}
}
class GeneralDisplay extends BaseDisplay
{
public function update(WeatherData $weatherData)
{
$this->display();
}
public function display()
{
print("GeneralDisplay().display\n");
}
}
$weatherData = new WeatherData();
display=newCurrentConditionDisplay(weatherData);
display2=newGeneralDisplay(weatherData);
$weatherData->setMeasurements(20,30,40);
weatherData−>removeObserver(display2);
print("after...\n");
$weatherData->setMeasurements(33,44,55);
?>
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本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2010/07/06/1771875.html，如需转载请自行联系原作者
