Java实现数字加密

public static void main(String[] args) {
        System.out.println("输入需要加密的数字的个数：");
        Scanner r = new Scanner(System.in);
        int length = r.nextInt();
        int arr[] = new int[length];
        for(int i = 0; i<arr.length; i++){
            System.out.println("请输入第"+ (i+1) +"加密数字：");
            int number = r.nextInt();
            arr[i] = number;
        }
        printArray(arr);
//数字加密
        for (int i = 0; i < arr.length; i++) {
            arr[i] = (arr[i] = + 5)%10;
        }
//数字反转
        for (int i = 0, j = 0; i < j; i++, j--) {
            int tem = arr[i];
            arr[i] = arr[j];
            arr[j] = tem;
        }
    }
//打印数组
    public static void printArray(int arr[]){
        System.out.println("[");
        for (int i = 0; i <arr.length ; i++) {
            System.out.println(i == arr.length-1 ? arr[i] : arr[i] + ",");
        }
        System.out.println("]");
    }