Java 8 primitive stream to collection mapping methods

Question

Is there any significant difference (in performance or best practices) between those two stream creation methods?

int[] arr2 = {1,2,3,4,5,6};

Arrays.stream(         


        

Answer 1

IntStream.boxed() uses Integer.valueOf(int) which is an optimised version* of Integer(int).

Internally, boxed() is defined as mapToObj(Integer::valueOf).

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^{*this method should generally be used in preference to the constructor Integer(int), as this method is likely to yield significantly better space and time performance by caching frequently requested values.}

^{The Javadoc of Integer.valueOf(int)}