一、冒泡排序
private static String bubbling() {
int[] arr = arr();
int index;
long startTime = System.nanoTime();
long startTime1 = System.currentTimeMillis();
for (int j = arr.length; j > 0; j--) {
for (int i = 0; i < j; i++) {
if (i < arr.length - 1) {
if (arr[i]