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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.
They use static methods so they don't have to instantiate an object of your class for testing, and the functions can be called directly.
The kata is nice.
But why are there Longs and static methods? I'm novice of CW and it looks like common. But I think better are Integers and non static class(methods)