private T[] array =(T[]) new Objects[10];

    @Override
    public void push(T elem) {
        int counter = 0;
        for (int i = 0; i < array.length; i++) {
            if (array[i] == null) {
                break;
            }
            counter++;
        }
        if (counter == 0) {
            array[0] = elem;
        } else {
            for (int i = 0; i < array.length; i++) {
                if (array[i] == null) {
                    array[i] = elem;
                }
            }
        }
    }