java冒泡排序从大到小从小到大哦

以下是Java中冒泡排序的实现，分别从大到小和从小到大排序：

1. 从大到小排序：

public class BubbleSort {
    public static void main(String[] args) {
        int[] arr = {5, 3, 8, 2, 1};
        int n = arr.length;

        for (int i = 0; i < n - 1; i++) {
            for ( j = 0; j < n - i - 1; j++) {
                if (arr[j] < arr[j + 1]) {
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }

        System.out.println("从大到小排序结果：");
        for (int i = 0; i < n; i++) {
            System.out.print(arr[i] + " ");
        }
    }
}

2. 从小到大排序：

public class BubbleSort {
    public static void main(String[] args) {
        int[] arr = {5, 3, 8, 2, 1};
        int n = arr.length;

        for (int i = 0; i < n - 1; i++) {
            for (int j = 0; j < n - i - 1; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }

        System.out.println("从小到大排序结果：");
        for (int i = 0; i < n; i++) {
            System.out.print(arr[i] + " ");
        }
    }
}