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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 it apparently doesn't have to because it works
I just wanted to keep splitting because it was a fun way to do it.
I know it's 3 years late but for others.
https://www.geeksforgeeks.org/stream-filter-java-examples/
I think going through the original documentation is smart but if you want included examples geeks for geeks usuallys has some good tutorials/examples.