PHP面向对象程序设计之对象生成方法详解
发布时间：2020-12-12 21:54:02 所属栏目：PHP教程 来源：网络整理
导读：本篇章节讲解PHP面向对象程序设计之对象生成方法。供大家参考研究具体如下： 对象 看个例子 name = $name; } abstract function fire();}class Minion extends Employee { // 奴隶 继承 雇员 function fire() { print "{$this->name}: I'll clear
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本篇章节讲解PHP面向对象程序设计之对象生成方法。分享给大家供大家参考，具体如下： 对象看个例子 name = $name;
}
abstract function fire();
}
class Minion extends Employee { // 奴隶 继承 雇员
function fire() {
print "{$this->name}: I'll clear my deskn";
}
}
class NastyBoss { // 坏老板
private $employees = array();
function addEmployee( $employeeName ) { // 添加员工
$this->employees[] = new Minion( $employeeName ); // 代码灵活性受到限制
}
function projectFails() {
if ( count( $this->employees ) > 0 ) {
$emp = array_pop( $this->employees );
$emp->fire(); // 炒鱿鱼
}
}
}
$boss = new NastyBoss();
$boss->addEmployee( "harry" );
$boss->addEmployee( "bob" );
$boss->addEmployee( "mary" );
$boss->projectFails();
// output:
// mary: I'll clear my desk
?>
再看一个更具有灵活性的案例 name = $name;
}
abstract function fire();
}
class Minion extends Employee {
function fire() {
print "{$this->name}: I'll clear my deskn";
}
}
class NastyBoss {
private $employees = array();
function addEmployee( Employee $employee ) { // 传入对象
$this->employees[] = $employee;
}
function projectFails() {
if ( count( $this->employees ) ) {
$emp = array_pop( $this->employees );
$emp->fire();
}
}
}
// new Employee class...
class CluedUp extends Employee {
function fire() {
print "{$this->name}: I'll call my lawyern";
}
}
$boss = new NastyBoss();
$boss->addEmployee( new Minion( "harry" ) ); // 直接以对象作为参数，更具有灵活性
$boss->addEmployee( new CluedUp( "bob" ) );
$boss->addEmployee( new Minion( "mary" ) );
$boss->projectFails();
$boss->projectFails();
$boss->projectFails();
// output:
// mary: I'll clear my desk
// bob: I'll call my lawyer
// harry: I'll clear my desk
?>
单例props[$key] = $val;
}
public function getProperty( $key ) {
return $this->props[$key];
}
}
$pref = Preferences::getInstance();
$pref->setProperty( "name","matt" );
unset( $pref ); // remove the reference
$pref2 = Preferences::getInstance();
print $pref2->getProperty( "name" ) ."n"; // demonstrate value is not lost
?>
点评：不能随意创建对象，只能通过Preferences::getInstance()来创建对象。 工厂模式getApptEncoder(); // 获取对象
print $bloggs->encode();
?>
output: Appointment data encoded in BloggsCal format 进一步增加灵活性设置 mode = $mode;
}
function getHeaderText() {
switch ( $this->mode ) {
case ( self::MEGA ):
return "MegaCal headern";
default:
return "BloggsCal headern";
}
}
function getApptEncoder() {
switch ( $this->mode ) {
case ( self::MEGA ):
return new MegaApptEncoder();
default:
return new BloggsApptEncoder();
}
}
}
$man = new CommsManager( CommsManager::MEGA );
print ( get_class( $man->getApptEncoder() ) )."n";
$man = new CommsManager( CommsManager::BLOGGS );
print ( get_class( $man->getApptEncoder() ) )."n";
?>
output: MegaApptEncoder BloggsApptEncoder 工厂方法模式要把创建者类与要生产的产品类分离开来。 抽象工厂通过抽象来来约束，成为一定的规矩。 getHeaderText();
print $mgr->getApptEncoder()->encode(); // 对象调用方法，返回对象，继续调用方法。
print $mgr->getFooterText();
?>
output: MegaCal header Appointment data encoded in MegaCal format MegaCal footer 更加牛逼的实现 getHeaderText();
print $mgr->make( CommsManager::APPT )->encode();
print $mgr->getFooterText();
?>
output: BloggsCal header Appointment data encoded in BloggsCal format BloggsCal footer 原型模式改造成一个保存具体产品的工厂类。 sea = $sea;
$this->plains = $plains;
$this->forest = $forest;
}
function getSea( ) {
return clone $this->sea; // 克隆
}
function getPlains( ) {
return clone $this->plains;
}
function getForest( ) {
return clone $this->forest;
}
}
$factory = new TerrainFactory( new EarthSea(),new EarthPlains(),new EarthForest() );
print_r( $factory->getSea() );
print_r( $factory->getPlains() );
print_r( $factory->getForest() );
?>
output: 更多关于PHP相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》、《》及《》 希望本文所述对大家PHP程序设计有所帮助。 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |