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I need to throw an exception if array contains a negative number.

What is best practices to do that using java8 features ?

Integer array = {11, -10, -20, -30, 10, 20, 30}; array.stream().filter(i -> i < 0) // then throw an exception
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    you should not throw an exception in a stream processing, that's an anti-pattern Commented Dec 27, 2020 at 14:43
  • @GovindaSakhare Thanks for the information. Have you got a source for that or a place to read more, please? Commented Dec 27, 2020 at 16:35

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You can use use Stream::anyMatch which return a boolean then if true thrown an exception like this:

boolean containsNegativeNumber = array.stream().anyMatch(i -> i < 0); if (containsNegativeNumber) { throw new IllegalArgumentException("List contains negative numbers."); }

Or directly as this:

if (array.stream().anyMatch(i -> i < 0)) { throw new IllegalArgumentException("List contains negative numbers."); }
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I think the second approach is great because you don't use any variable to throw the exception

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