【讨论】开始有点烦面向对象了,不知道你们如何看
【讨论】开始有点烦面向对象了,不知道你们怎么看?
记得最早接触面向对象是java
后来做php了,面向对象的特性 继承 封装 多态。
1.继承,继承多了 你都不知道哪里来的对象(当然这是设计者的问题,可是貌似大多数程序员的代码写的都不是很好,特别是业务复杂过后)。
网站数据源很多,有的是cache(这里特指内存的) 有的是文件 有的是数据库,出错了,都不知道哪里来的数据。一个个去排除。封装直接挡道了。
2.封装,本来是为了保证上层不用管下层,同时数据被封起来对外只提供方法,不会被外部修改。可是一般公司分工不是有人专门写 数据源层 逻辑层 这么分工的吧。而是基本按照业务分工。谁也不敢说我的数据访问层就没问题,谁也不敢说 我的某个类不出问题。至于数据的封装在web方面真的意义不大。
3.多态。php不支持,只有方法重写。
另外php对象的调用要多次查hash表,性能不高。其实php的类使用hash表来实现的,说白了和array比他反而是在array上面的hash表上封装。不如用array。
对于面向对象的应用在php,只觉得用在例如生成缩略图 数据库的操作封装 图片的操作封装 这些地方用我觉得倒是十分合适。
欢迎讨论。
------解决方案--------------------
面向对象,是一种思维方式
面向对象编程,是一种方法
软件工程中有:自顶向下分析,自底向上编程。描述的是面向过程的编程方法,他需要对所涉及的每个细节都深入了解。
面向对象的编程方法是 自顶向下分析,自顶向下编程。他不需要一开始就了解细节,而是在过程中逐渐展开。暂时不了解的环节放个空对象就可以了
面向对象给编程带来很多方便,也必然带来更多的系统开销
这就是为什么 windows 操作系统从开始的 10M 变成现在的300、400M,功能增加了不少,而速度却越来越蜗牛
------解决方案--------------------
楼上说的在点。
传统编程是数据结构+函数,有了面向对象思想以后,它就变成了数据结构和操作该数据结构的方法, 也就是更明确了功能的划分。
C语言有指针甚至是函数指针,可以直接操作指定地址的内存,用C实现面向对象中的派生,多态之类的非常简单,但对于绝大多数语言来说,它们并没有那么灵活的特性,所以都提供了类这些语言特性专门支持面向对象,不要怪它们。
另外,面向对象注重内聚,所以也意味着不同对象间的通信非常依赖于明确的消息,所以开发时接口的设计变得更加需要思考设计。

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