PHP 面向对象 final类与final方法
Fatal error: Class SuperMath may not inherit from final class (Math) in E:PHPProjects est.php on line 14
- <?php
- //声明一个final类Math
- class Math{
- public static $pi = 3.14;
- public function __toString(){
- return "这是Math类。";
- }
- public final function max($a,$b){
- return $a > $b ? $a : $b ;
- }
- }
- //声明类SuperMath 继承自 Math类
- class SuperMath extends Math {
- public final function max($a,$b){}
- }
- //执行会出错，final方法不能被重写。
- ?>
- <?php
- //声明一个final类Math
- final class Math{
- public static $pi = 3.14;
- public function __toString(){
- return "这是Math类。";
- }
- }
- $math = new Math();
- echo $math;
- //声明类SuperMath 继承自 Math类
- class SuperMath extends Math {
- } //开源代码phpfensi.com
- //执行会出错，final类不能被继承。
- ?>
Fatal error: Class SuperMath may not inherit from final class (Math) in E:PHPProjects est.php on line 16