Check style problem

[SamFKC]

After running check style, it was found that there was a style problem. However, I do not understand what the problem is. What is the issue in the code?

[Troublor]

The rule of style check says, a static final variable match the given regular expression, i.e., only use all-capital words and separate with underscore.

[henryhchchc]

Well it mean that the name of the field must match the regular expression ^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$. I would say the translation of "表达式" is inaccurate. It should be "正则表达式" instead. You can check the visualizer if you don't know what this regular expression means.