Ref: Effective Java by Joshua Bloch
In this item, Mr Bloch mention about same symptom I have faced previously and shared in this post.
The constant interface pattern is a poor use of interfaces:
Instead use a utility class
If you make heavy use of the constants exported by a utility class, you can avoid the need for qualifying the constants with the class name by making use of the static import facility
In summary, interfaces should be used only to define types, they should not be used to export constants.
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