<?php function __autoload($class_name) { include_once $class_name.'.php'; } class Client { private $light; public function __construct() { $this->light = new Light(); $this->light->turnLightOn(); $this->light->turnLightBrighter(); $this->light->turnLigthBrightest(); $this->light->turnLightOff(); $this->light->turnLigthBrightest(); } } $worker = new Client();
运行结果如下
灯打开!可以看见帅哥chenqionghe了!
灯更亮了, 看帅哥chenqionghe看得更真切了!
灯最亮了, 看帅哥chenqionghe已经帅到无敌!
灯关闭!看不见帅哥chenqionghe了!
不合法的操作!
九宫格移动示例
九宫格的移动分为4个移动:
上(Up)
下(Down)
左(Left)
右(Right)
对于这些移动,规则是要求单元格之间不能沿对角线方向移动. 另外, 从一个单元格移动到下一个单元格时, 一次只能移动一个单元格
要使用状态设计模式来建立一个九宫格移动示例,
建立接口
IMatrix.php
<?php interface IMatrix { public function goUp(); public function goDown(); public function goLeft(); public function goRight(); }
虽然这个状态设计模式有9个状态, 分别对应九个单元格, 但一个状态最多只需要4个变迁
上下文
对于状态中的4个变迁或移动方法, 上下文必须提供相应方法来调用这些变迁方法, 另外还要完成各个状态的实例化.
Context.php
<?php class Context { private $cell1; private $cell2; private $cell3; private $cell4; private $cell5; private $cell6; private $cell7; private $cell8; private $cell9; private $currentState; public function __construct() { $this->cell1 = new Cell1State($this); $this->cell2 = new Cell2State($this); $this->cell3 = new Cell3State($this); $this->cell4 = new Cell4State($this); $this->cell5 = new Cell5State($this); $this->cell6 = new Cell6State($this); $this->cell7 = new Cell7State($this); $this->cell8 = new Cell8State($this); $this->cell9 = new Cell9State($this); $this->currentState = $this->cell5; } //调用方法 public function doUp() { $this->currentState->goUp(); } public function doDown() { $this->currentState->goDown(); } public function doLeft() { $this->currentState->goLeft(); } public function doRight() { $this->currentState->goRight(); } //设置当前状态 public function setState(IMatrix $state) { $this->currentState = $state; } //获取状态 public function getCell1State() { return $this->cell1; } public function getCell2State() { return $this->cell2; } public function getCell3State() { return $this->cell3; } public function getCell4State() { return $this->cell4; } public function getCell5State() { return $this->cell5; } public function getCell6State() { return $this->cell6; } public function getCell7State() { return $this->cell7; } public function getCell8State() { return $this->cell8; } public function getCell9State() { return $this->cell9; } }
状态
9个状态表示九宫格中的不同单元格, 为了唯一显示单元格,会分别输出相应到达的单元格数字, 这样能够更清楚地看出穿过矩阵的路线.
Cell1State
<?php class Cell1State implements IMatrix { private $context; public function __construct(Context $contextNow) { $this->context = $contextNow; } public function goLeft() { echo '不合法的移动!<br />'; } public function goRight() { echo '走到<strong>2</strong><br />'; $this->context->setState($this->context->getCell2State()); } public function goUp() { echo '不合法的移动!<br />'; } public function goDown() { echo '走到<strong>4</strong><br />'; $this->context->setState($this->context->getCell4State()); } }
Cell2State
<?php class Cell2State implements IMatrix { private $context; public function __construct(Context $contextNow) { $this->context = $contextNow; } public function goLeft() { echo '走到<strong>1</strong><br />'; $this->context->setState($this->context->getCell1State()); } public function goRight() { echo '走到<strong>3</strong><br />'; $this->context->setState($this->context->getCell3State()); } public function goUp() { echo '不合法的移动!<br />'; } public function goDown() { echo '走到<strong>5</strong><br />'; $this->context->setState($this->context->getCell5State()); } }
Cell3State