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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.
Java translation
Should work as intendet, if it is OK it can be approved.
Java translation
I haven't changed much about the description (none -> null), which could need some improvements.
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I really like this Kata, but in my opinion the fact that the BadCodeException will get thrown out if the inputCode for unlocking the chest is wrong should be writen in the description, as this wasn't immediately clear to me.