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Constant should be such that it uniquely identifies the value it holds and context of the value. SEVEN uniquely identifies the value but doesn't express the context.
Though NUMBER_OF_DAYS_IN_WEEK and NUMBER_OF_DAYS_IN_WEEK_7 makes sense in terms of unique value identification and context but 7 at the end of constant name appears useless as all weeks have 7 days and hence it's the only value it can hold. If it would have been "number of days in a month", it would have made sense to include number of days at the end like
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|Like Discuss Correct / Improve  constant variables  static final variable  java conventions  java naming conventions|
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|What is the advantage of using static final or constant variables in Java ?|
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|How do we define constant variables in Java ?|