final关键字的应用

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//final关键字的应用,定义类和定义方法//使用final关键标记的类不能被继承；//使用final关键标记的方法不能被子类覆盖重写，是最终版本；final class Person{ }class Student extends Person{}
//Fatal error: Class Student may not inherit from final class (Person) inF:\phpStudy\WWW\Obj\obj5.php on line 16

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class Person{ final function say(){ }}class Student extends Person{function say(){}}
//Fatal error: Cannot override final method Person::say() in F:\phpStudy\WWW\Obj\obj5.php on line 32