в 10:37, 26 мая 2010

2010-05-26T10:37:27Z

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2010-05-26T07:00:45Z

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==Declaring Final Classes and Methods==



<source lang="html4strict">

<?php
final class NoExtending {
public function myFunction() {
}
}
class restrictedExtending {
final public function anotherFunc() {
}
}
class myChild extends restrictedExtending {
public function thirdFunction() {
}
}
?>

</source>

==final class==



<source lang="html4strict">

<?php
final class Checkout {
// ...
}
class IllegalCheckout extends Checkout {
// ...
}
$checkout = new Checkout();
?>

</source>

==final keyword can be used to declare a class uninheritable==



<source lang="html4strict">

<?
final class Dog {
private $Name;
public function getName( ) {
return $this->Name;
}
}
class Poodle extends Dog {
public function bark( ) {
print ""Woof", says " . $this->getName( );
}
}
?>

</source>

==Final Methods==



<source lang="html4strict">

class Item {
private $id = 555;
final function getID() {
return $this->id;
}
}

class PriceItem extends Item {
function getID() {
return 0;
}
}
It generates the following error:
Fatal error: Cannot override final method item::getid()

</source>

==The final keyword is used to declare that a method or class cannot be overridden by a subclass==



<source lang="html4strict">

<?
class Dog {
private $Name;
private $DogTag;
final public function bark( ) {
print "Woof!\n";
}
}
?>

</source>

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PHP/Class/final - История изменений

в 10:37, 26 мая 2010

Admin: 1 версия