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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.
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No you're right, because you have to add yourPoints to the average, so the number of Points increases to length + 1
Because in the second For loop you compare all characters with the current character at index i, so also the character with itself. And of course, when you compare something to itself, it's the same.
Because the operator '*' cannot be used for Object. Neither can Integer::sum be used for Object. You should have made the list an integer list, so List<Integer>. Lists include, as long as you don't specify it, Objects.