In addition to Weibo, there is also WeChat
Please pay attention
WeChat public account
Shulou
2025-04-03 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
Share
Shulou(Shulou.com)06/01 Report--
PHP 5 adds the final keyword. If a method in a parent class is declared final, a subclass cannot override that method. If a class is declared final, it cannot be inherited.
first embodiment
second example of the
Note: Properties cannot be defined as final, only classes and methods can be defined as final.
If we do not want a class to be inherited, we use final to decorate the class. This class cannot be inherited.
final---Used before classes and methods.
final class---cannot be inherited.
final method---cannot be overridden.
Final classes cannot be inherited.
If we do not want a class to be inherited, we use final to decorate the class. This class cannot be inherited. For example, the Math class we set involves the mathematical calculation methods we want to do. These algorithms do not need to be modified or inherited. We set it to final type.
Program Run Results
Fatal error: Class SuperMath may not inherit from final class (Math) in E:\PHPProjects\test.php on line 14
final method cannot be overridden
If you don't want a method in your class to be overridden by a subclass, you can make it final by prepending it with the final modifier.
If this method is overridden by a subclass, an error will occur.
Program Run Results
Fatal error: Class SuperMath may not inherit from final class (Math) in E:\PHPProjects\test.php on line 16
Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.
Views: 0
*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.
Continue with the installation of the previous hadoop.First, install zookooper1. Decompress zookoope
"Every 5-10 years, there's a rare product, a really special, very unusual product that's the most un
JosephTime Limit: 1000MSMemory Limit: 10000KTotal Submissions: 53862Accepted: 20551DescriptionThe Jo
© 2024 shulou.com SLNews company. All rights reserved.