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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.
Empty string is a string literal, and it will be stored in internal string pool, available for reuse. So it won't be garbage-collected, at least not as usual objects.
Instead of concatenating Strings, using StringBuilder and appending each String would be more GC and heap memory friendly.
Looks cool but produces 2 String objects; one is empty string and the other one is empty string + numberString
Not very clever because of possible GC it causes.