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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.
you can use
which will be false if
haystack[i]is null, instead of throwing a NullPointerExceptionTried it similar to this but wanted to use ".equals". The problem was, that it "equals" also with boolean and null within the string when it tests. Any clue how to avoid this?