将null与对象进行比较，而不是将对象与null进行比较有什么问题 [英] What is wrong in comparing a null with an object rather than an object with a null

问题描述

我刚刚发现我可以像这样比较 null 和 Object
$ b

if（null！= Object）

$ c> Object 与 null ，例如

  Object！= null 
  

如果使用前一种方法，可能会出错？

这是合法吗？如果没有，为什么编译器接受它？

解决方案

如果你想写一个干净的代码，你应该关心它的方式，将在未来读。它需要是明显的，它做什么，为什么它做某一件事。如果你把对象放在评价的右边，你真正做什么就变得不那么明显了。至少在我看来...

I just found out that I can compare null with an Object like this,

if(null != Object)

Rather than comparing Object with null, like

Object != null

What may go wrong if use the former approach?

Is that legal? If not then why does compiler accept it?

解决方案

There's one thing wrong about it - readability. If you want to write a clean code, you should care about the way it will be read in the future. It needs to be obvious, what it does and why it does a certain thing. If you place the "Object" to the right of the evaluation, it becomes less apparent what are you really doing. Well at least in my opinion...

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