簡單工廠模式

什麼叫簡單工廠模式？

 簡單工廠模式又叫靜態工廠方法，專門定義一個類來負責創建其他類的實現，屬於類的創建型模式。

 

計算器實現簡單的工廠模式

 <?php /** * 工廠類 */ class Factory { public static function create($operation) { switch($operation) { case "+": $result = new Add(); break; case "-": $result = new Sub(); break; case "*": $result = new Mul(); break; case "/": $result =new Div(); break; } return $result; } } /** * 運算類 */ abstract class Operation { protected $num1; protected $num2; public function set_num($num1,$num2) { $this->num1=$num1; $this->num2=$num2; } abstract function get_result(); } /** * 加法類 */ class Add extends Operation { public function get_result() { return $this->num1+$this->num2; } } /** * 減法類 */ class Sub extends Operation { public function get_result() { return $this->num1-$this->num2; } } /** * 乘法類 */ class Mul extends Operation { public function get_result() { return $this->num1*$this->num2; } } /** * 除法類 */ class Div extends Operation { public function get_result() { return $this->num1/$this->num2; } } $opear = Factory::create("+"); $opear->set_num(6,3); echo $opear->get_result(); echo "<br/>"; $opear = Factory::create("-"); $opear->set_num(6,3); echo $opear->get_result(); echo "<br/>"; $opear = Factory::create("*"); $opear->set_num(6,3); echo $opear->get_result(); echo "<br/>"; $opear = Factory::create("/"); $opear->set_num(6,3); echo $opear->get_result();  

顯示結果：

9

3

18

2