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Clan:metrica_mar24
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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Please spare us the input validation. Short inputs are fine, but
nullor invalid inputs just distract. Do one thing, and do it well. Input validation has been done."return -1" does not sound very idiomatic for Java. Maybe something else would be more expressive, for example
OptionalIntor theIntegerandnull?