英文:
Why are java interface constants treated as non-public by ConstantName check in Checkstyle
问题
在我们的项目中，我们希望确保私有常量始终以**_（下划线）开头，而其他常量则不以下划线开头。
Checkstyle检查ConstantName**未将接口常量视为公共常量，并应用了私有修饰符的规则。
我们在我们的Gradle项目中使用Checkstyle 8.35来分析Java代码（OpenJdk 11，Gradle 6.4）。
以下是具有常量的接口的代码片段。
public interface MyInterface() {
int MAX_SIZE = 1024;
//Some methods here
}
ConstantName检查的Checkstyle配置如下：
<module name="ConstantName">
<property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
<property name="applyToPrivate" value="false"/>
</module>
<module name="ConstantName">
<property name="format" value="^_[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
<property name="applyToPublic" value="false"/>
<property name="applyToProtected" value="false"/>
<property name="applyToPackage" value="false"/>
</module>
运行Checkstyle分析后，将报告错误，错误消息为Name 'MAX_SIZE' must match pattern '^_[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$'，而我们的期望是没有错误。
英文:
In our project we want to ensure that the private constants always start with _ (underscore) and rest all do not start with an underscore.
The checkstyle check ConstantName fails to treat the interface constants as public and applies the rules of private modifier.<br>
We are using checkstyle 8.35 in our gradle project to analyse java code (OpenJdk 11, Gradle 6.4).
Below is the code snippet of Interface with constants.
public interface MyInterface() {
int MAX_SIZE = 1024;
//Some methods here
}
Checkstyle configuration for ConstantName check is as below
<module name="ConstantName">
<property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
<property name="applyToPrivate" value="false"/>
</module>
<module name="ConstantName">
<property name="format" value="^_[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
<property name="applyToPublic" value="false"/>
<property name="applyToProtected" value="false"/>
<property name="applyToPackage" value="false"/>
</module>
Post running the checkstyle analysis the error is reported for MAX_SIZE as Name 'MAX_SIZE' must match pattern '^_[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$'. while our expectation is No Errors.
答案1
得分: 4
根据源代码的快速扫描，这似乎是一个错误。只有在关键字public存在时（这在类中是这样，但在接口中不是这样）才认为常量是公共的。
我建议将此问题报告给https://github.com/checkstyle/checkstyle/issues。
英文:
Judging by a quick scan of the source code, this is a bug. They're only considering the constant to be public if the keyword public is present (which is the case in classes, but not interfaces).
I would suggest reporting this as an issue at https://github.com/checkstyle/checkstyle/issues
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