Can't show output of my random array when I call method

public class Main {

    public static void main(String[] args) {
        Lottery nums = new Lottery();

        System.out.print(nums.getLotteryNumbers());
    }
}

class Lottery {
    int[] lotteryNumbers;

    Lottery() {
        Random randomNum = new Random();
        int[] lotteryNumbers = new int[6];

        for (int i = 0; i < lotteryNumbers.length; i++) {
            lotteryNumbers[i] = randomNum.nextInt(10);

        }

    }

    public int[] getLotteryNumbers() {
        return lotteryNumbers;
    }
}

I get a null every time I try to print out my Random array, if you can please point me to what I'm doing wrong I'd really appreciate it thanks!