package 冒泡排序;import java.text.SimpleDateFormat;import java.util.Arrays;import java.util.Date;public class Bubble {public static void main(String[] args) {int[] arr = { 9,5,7,3,6,1,4,2,8};// int[] arr = new int[100000];// for (int i = 0; i < 100000; i++) {// arr[i] = (int) (Math.random() * 100);// }System.out.println("原数组为："+Arrays.toString(arr));Date d1 = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yy年MM月dd日 HH:mm:ss");String start = sdf.format(d1);System.out.println("排序前时间："+start);BubbleSort(arr);Date d2 = new Date();String end = sdf.format(d2);System.out.println("排序后时间："+end);}public static void BubbleSort(int arr[]) {int temp = 0;boolean flag = false;for (int i = 0; i < arr.length - 1; i++) {for (int j = 0; j < arr.length - 1 - i; j++) {if (arr[j] > arr[j + 1]) {flag = true;temp = arr[j];arr[j] = arr[j + 1];arr[j + 1] = temp;}}//代码优化 当不发生交换时，跳出本次循环if (!flag) {break;} else {flag = false;}// System.out.println("第" + (i + 1) + "次排序的数组为：" + Arrays.toString(arr));}System.out.println("排序后的数组为：" + Arrays.toString(arr));}}
