在java中检查字符串/对象的空值? [英] Checking null value for a String/Object in java?

问题描述

有什么好处

String a = null;
if(null != a)

结束

if(a !=null)

我尝试了两种语句，它们都运行良好.有什么建议为什么我应该选择第一个?

I tried both statement and they worked fine. Any suggestions why should I go with the first one?

推荐答案

两者都是一样的，但是如果你在一个布尔值上检查 == :

Both are the same, however if you are checking for == on a boolean value:

if(a == true)

对比

if(true == a)

后者会更好，因为只输入 = 而不是 == 会导致排版错误:

The latter would be better due to the tendency of typographical error by typing only = instead of ==:

if(a = true) //still compilable but not what you intended
if(true = a) //cannot be compiled, hence you know you typed it wrongly

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