I have a exercise where I have to write a Stack class with the push and pop methods. The code compiles and works as it should. Are there better practices to use in my code? Is there something I should avoid doing?

public class Stack {

    private final int INCREMENTSIZE = 1024;
    Integer position = 0;

    int[] list = null;

    public Stack(){
        list = new int[INCREMENTSIZE];
    }

    public void push(Integer i) {
        if(position == list.length) {
            list = Arrays.copyOf(list, list.length + INCREMENTSIZE);
        }
        list[position++] = i;
    }

    public Integer pop(){
        return list[--position];
    }
}