Hey, the subject of this mail is pretty self-explanatory. Why do we need a package private validate() method, given the fact, that users can not create custom instances (constructor is package private)? You could even argue, that no validation is needed at all, since we are in control of what formats can be created. However I'd say, the validation makes sure that we do not unintentionally create invalid formats. But then validate() can be made private and called at the end of the constructor.
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