冒泡排序

int[]  arr={5,8,9,3,2,1,6,7};
    System.out.println("排序前数组为：");
    for (int num:arr){
        System.out.println(num + " ");
    }
    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]) {
                int temp = arr[j];
                arr[j] = arr[j+1];
                arr[j+1] = temp;
            }
        }
    }
    System.out.println();
    System.out.println("排序后的数组为：");
    for (int num:arr) {
        System.out.println(num+" ");
    }
}