冒泡排序，并输出每一趟的排序结果

public static void main(String[] args) {
        int[] arr = {6, 3, 8, 2, 9, 1};
        for (int i = 1; i < arr.length; ++i) {
            for (int j = 1; j < arr.length - i; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
            System.out.print("第" + i + "趟排序的结果：");
            for (int num : arr) {
                System.out.print(num + " ");
            }
            System.out.println();
        }

    }