[分享][设计模式]head first 设计模式之PHP实现 第一章

[YIDAY]

head first 设计模式里面是用JAVA来实现的，由于现在从事PHP工作，所以用PHP重写书本上的代码以便应用在以后的实际工作中，经验尚浅，不当之处请各位斧正。

head first 设计模式里面是用JAVA来实现的，由于现在从事PHP工作，所以用PHP重写书本上的代码以便应用在以后的实际工作中，经验尚浅，不当之处请各位斧正。
   1. <?php  
   2. /* 
   3.  * author 落寞三少  
   4.  * email [e-mail] 
   5.  * qq 398504533 
   6.  * 
   7.  */  
   8.  abstract class Duck {  
   9.     public $flyBehavior;  
  10.     public $quackBehavior;  
  11.     function display(){}  
  12.       
  13.     public function performFly(){  
  14.         $this->flyBehavior->fly();  
  15.     }  
  16.       
  17.     public function performQuack(){  
  18.         $this->quackBehavior->quack();  
  19.     }  
  20.       
  21.     public function swim(){  
  22.         echo '所有DUCK都会FLOAT';  
  23.     }  
  24.       
  25.     public function setFlyBehavior($fb){  
  26.         $this->flyBehavior = $fb;  
  27.     }  
  28.       
  29.     public function setQuackBehavior($qb){  
  30.         $this->quackBehavior = $qb;  
  31.     }  
  32. }  
  33. interface FlyBehavior {  
  34.         public function fly();  
  35. }  
  36. interface QuackBehavior {  
  37.     public function quack();  
  38. }  
  39. class FlyWithWings implements FlyBehavior {  
  40.     public function fly(){  
  41.         echo 'I am flying!!';  
  42.     }  
  43. }  
  44. class FlyNoWay implements FlyBehavior {  
  45.     public function fly(){  
  46.         echo 'I can\'t fly!';  
  47.     }  
  48. }  
  49. class FlyRocketPowered implements FlyBehavior {  
  50.     public function fly(){  
  51.         echo 'I am flying with a rocket!';  
  52.     }  
  53. }  
  54. class Quack implements QuackBehavior {  
  55.     public function quack(){  
  56.         echo 'guagua';  
  57.     }  
  58. }  
  59. class MuteQuack implements QuackBehavior {  
  60.     public function quack(){  
  61.         echo 'silence';  
  62.     }  
  63. }  
  64. class Squeak implements QuackBehavior {  
  65.     public function quack(){  
  66.         echo 'squeak';  
  67.     }  
  68. }  
  69. //////////////////////////////////  
  70. class MallardDuck extends Duck {  
  71.     public function __construct(){  
  72.         $this->quackBehavior = new Quack();  
  73.         $this->flyBehavior = new FlyWithWings();  
  74.     }  
  75.     public function display(){  
  76.         echo 'I am a real Mallard duck!';  
  77.     }  
  78. }  
  79.   
  80. $mallardduck = new MallardDuck();  
  81. $mallardduck->display();  
  82. echo '<br />';  
  83. $mallardduck->performQuack();  
  84. echo '<br />';  
  85. $mallardduck->setFlyBehavior(new FlyRocketPowered());  
  86. echo '<br />';  
  87. $mallardduck->performFly();  

?>

OO基础：抽象、封装、多态、继承

OO原则：封装变化、多用组合，少全继承、针对接口编程，不针对实现编程

OO模式：策略模式－－－定义算法簇，分别封装起来，让它们可以互相替换。