arraylist整数中出现意外结果-pde

Question

I write a function that sums up the elements of arrays in a 2d list and add them in a 1d list:

  ArrayList<Integer> sumList(ArrayList<int[][]> list,int side){
    ArrayList<Integer> sums= new ArrayList<Integer>();
    for(int[][] array : list){
    int arraySum = 0;
    //arraySum += CalcMove(array,side);
      for(int i = 0; i < 8; i++){
          for(int j = 0; j < 8; j++){
            arraySum+=array[i][j];
          }
      }
      sums.add(arraySum);
      //println(arraySum);
    }
    println(sums);
    //sums.add(0);
    //println(sums);
    return sums;
  }

The problem is, the result are totally irrelevant,ambiguous and not even in a list. The println result:

[-232, -232, -232] -232 [-232, -232, -232] -232 [-223, -223, -223] -223 [-223, -223, -223, -223] -223 [-219, -219, -219] -219 [-214, -214, -214] -214 [-14, -14, -14] -14 [-10, -10, -10] -10 [-5, -5, -5] -5 [-4, -4, -4, -4] -4 [-4, -4, -4, -4] -4 [-4, -4, -4, -4] -4 [-4, -4, -4, -4] -4 [-4, -4, -4, -4] -4 [-4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4] -4 []

But when I add another element outside the loops (in this case it's zero), the result will be OK (I'm still not sure it is). the println result after this:

[-232, -232, -232, 0]

I'm totally confused about this since I'm pretty sure the function does not have any problem cause I tested individually and it's worked just fine. And it couldn't be the arraylist cause I wrote the entire project in c# and it's worked just fine, too.

Answer 1

Here is a method that collects all integer in a 2d array and put them into a list.

    public static List<Integer> listElements(int[][] array) {
        List<Integer> list = new ArrayList<Integer>();
        for (int[] subArray : array) {
            IntStream.of(subArray).forEach(i -> list.add(i));
        }
        return list;
    }