问题
My question: Should names of constant Java variables (within methods) be upper-case?
I've always been under the impression that
a) if a variable is never going to change, it should be declared final (to show/enforce that it won't change) b) it should be named in upper-case
However, I've noticed in eclipse, when changing a variable (within a method) to be final/constant, and subsequently refactoring/renaming it to something like below:
final int NODE_COUNT = 3;
I get the following warning:
This name is discouraged. According to convention, names of local variables should start with a lowercase letter.
Which makes me wonder if the upper-case rule doesn't apply in this instance (i.e. final variable within a method).
回答1:
Within methods you don't have constants, you just have local variables, that can be final. So using normal camelCase starting with lowercase is perfectly suiting there.
回答2:
Class constants should also be static (making them class-level instead of instance-level), in which case Eclipse will not warn you about using Uppercase.
Method constants should have identifiers starting with a lower-case letter, though, so I agree with your conclusion.
来源：https://stackoverflow.com/questions/10978338/should-i-use-upper-case-naming-to-declare-java-constant-variables