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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.
Thank you for these two points.
Yeah, I've noticed that yet =)
Yeah, you're totally right! I just completed this kata by a solution which was very similiar to this one and I didn't focus on performance. But I should have considered this. I adjusted my solution and added a test case with Integer's minimum and maximum values. I hope this matches with your expectations ;)
It's great that you like it and welcome back to java;)