null!= object和object之间有什么区别!= null [英] what is the difference between null != object and object!=null
问题描述
可能重复:
哪种方式更好“ null!= object”或ldquo; object!= null”?
为什么人们常常看到null!= variable”代替“变量!= null”在C#中?
‘ … != null’或者‘ null!=…’最佳表现?
请指导我。
null!= object和object之间的区别是什么!= null
对于.equal(something)和something相同.equals()
Please guide me.
what is the difference between null != object and object!=null
same for "".equal("something") and "something".equals("")
哪一个有利于处理。
推荐答案
前两个是等价的,但是null!= object是一种古老的做法,它可以编写if(object = null)并且意外地将null赋给对象。这是一个阻止这次事故发生的警卫。
The first two are equivalent, but the "null != object" is an old practice from languages where it is valid to write "if (object = null)" and accidentally assign null to the object. It is a guard to stop this accident from happening.
第二个虽然等价有额外的好处,如果something为null你将不会获得空引用异常,而如果你这样做的话:.equals()。
The second whilst equivalent has the added advantage that if "something" is null you will not get a null reference exception whereas you would if you did: something".equals("").
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