数组排序，数组转化为List，通过List的sort排序， 升序o1-o2

数组排序

int[] arr = {3, 4, 5, 1, 2, 6, 7, 9, 8};

Integer[] arr2 = new Integer[arr.length];
for(int i=0; i<arr.length; i++) {
    arr2[i] = arr[i];
}

List<Integer> list = Arrays.asList(arr2);
list.sort(new Comparator<Integer>() {
    @Override
    public int compare(Integer o1, Integer o2) {
        return o1-o2;
    }
});

for(Integer tmp: list) {
    System.out.print(tmp +" ");
}