int[] primitiveArray = { 1, 2, 3, 4, 5 }; Integer[] boxedArray = Arrays.stream(primitiveArray) // IntStream .boxed() // Stream<Integer> .toArray(Integer[]::new); System.out.println(Arrays.toString(boxedArray));
int i, k = 0; for (i = 0; i < n; i++) k = 10 * k + a[i];