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I've read on many Web sites Optional should be used as a return type only, and not used in method arguments. I'm struggling to find a logical reason why. For example I have a piece of logic which has 2 optional parameters. Therefore I think it would make sense to write my method signature like this (solution 1): Many web pages specify Optional should not be used as method arguments.
Use flatMap as you are trying to add elements into the pipeline or a 1-to-many mapping. Map is a one to one mapping. ArrayList<Integer> result = (ArrayList<Integer>) IntStream.rangeClosed(1, 10) .boxed() .filter(i -> 10 % i == 0) .flatMap((Integer i) -> {return i!=5 ?
Use flatMap as you are trying to add elements into the pipeline or a 1-to-many mapping. Map is a one to one mapping. ArrayList<Integer> result = (ArrayList<Integer>) IntStream.rangeClosed(1, 10) .boxed() .filter(i -> 10 % i == 0) .flatMap((Integer i) -> {return i!=5 ?
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