How to fix list.contains(object) not returning the good boolean variable

I am trying to make a list with some array, generated random, within a range and with a fixed size. The problem is, when I want to see if an array is already in the list (list.contains(array)) it's not returning the good boolean variable. This is how this code looks like, and I have no idea from where's the problem:

List<int[]> list = new ArrayList<int[]>();
int[] v = new int[n];
int n = 2, val_max = 3;

while (list.size() != max) {
  v = getRandomArray(n, 1, val_max);
  if (list.contains(v) == false)
    list.add(v);
}

I expect the output for that to be { {1, 2} {2, 1} {1, 3} {3, 1} {2, 3} {3, 2} } but the output keeps changing... It always doubles one or two of the above values which is what made me think that the problem must be from the contains function.