Arrays.parallelSort(arr1, (o1, o2) -> o1.length() - o2.length()); //arr1按元素长度排序
Arrays.parallelPrefix(arr2, (left, right)-> left * right); //arr2累次相乘,
/*结果由
[
(3*-4),
(3*-4*25),
(3*-4*25*16),
(3*-4*25*16*30),
(3*-4*25*16*30*18)
]
得出*/
Arrays.parallelSetAll(arr3 , operand -> operand * 5); //arr3每个元素乘5