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

The second is better as it creates no Integer objects in this example.

From the JLS 5.1.7

If the value p being boxed is ... an int ... between -128 and 127 (inclusive), then let r1 and r2 be the results of any two boxing conversions of p. It is always the case that r1 == r2.

Generally speaking, you should not call new on wrapper types, but use their static factory methods - for example Integer.valueOf