arrays - Java ArrayList for integers

Question

I have values that I'd like to add into an ArrayList to keep track of what numbers have shown up. The values are integers so I created an ArrayList;

ArrayList<Integer[]> list = new ArrayList<>();
int x = 5
list.add(x);

But I'm unable to add anything to the ArrayList using this method. It works if I use Strings for the array list. Would I have to make it a String array and then somehow convert the array to integers?

EDIT: I have another question. I'd like the list to only hold 3 values. How would I do so?

Answer 1

List of Integer.

List<Integer> list = new ArrayList<>();
int x = 5;
list.add(x);