编辑代码

class Main {
	public static void main(String[] args) {
        //Scanner sc = new Scanner(System.in); //输入格式
        //int k = Integer.parseInt(sc.nextLine()); //
        //int[] arr = sc.nextLine(); //
        int k = 4;
        int[] arr = {5,4,2,1};
        int[] array = bubbleSort(arr);
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + "、");
        }
	}

    public static int[] bubbleSort(int[] arr){
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length - i - 1; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j + 1];
                    arr[j + 1] = arr[j];
                    arr[j] = temp;
                }
            }
        }
         return arr;
    }
}