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My boss said I should use null == obj, because it's better than obj == null, but he didn't remember why to do this. Is there any reason for using null == obj?
I feel it somehow... opposite!
After some search on Google, the only thing I found is:
in C, it prevents you accidentally from typing (obj = null) in a conditional structure.
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There is absolutely no difference in either semantics or performance. The == in this case is a reference inequality operation; it can never throw NullPointerException .
A null object refers to an object without any reference or an object defined with neutral/null functionality/behavior. These null objects need to be checked to ensure that they are not null while accessing any member or invoking any methods.
out. println("(Object)string == number: " + ((Object)string == number)); To conclude this post and answer the titular question Does null equal null in Java? the answer is a simple yes.
7. == and != The comparison and not equal to operators are allowed with null in Java.
You can't accidently assign null to obj by typing obj = null instead. However, that's a reminiscence from C times, in java, it is not possible, as the = expression returns the right hand side of the assignment. As null is not a boolean, the compiler will complain.
I would try to explain it to my boss once, demonstrate it. If he still doesn't agree with you, just do it. It's a petty thing to fight about with your boss.
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