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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.
Well, just the regular concat (
+sign, I mean).If you're looking for a way to optimize, changing the way to combine the chars is not the way to go. Instead, search for a way to reduce your loop.
It's real ;)
Not an issue, use
System.out.println. Also, you probably should read the section of the docs about training on kata.Cheers