Generate a unique random number for each array value

I have this method that generates a number (1-10) for each array value listed in this method. I want the whole set of numbers to be displayed as a set of unique numbers. How to do this?

public static int generateNumbers(int[] lotteryNumbers) {

    Random randNum = new Random();

    lotteryNumbers[0] = randNum.nextInt(10);
    lotteryNumbers[1] = randNum.nextInt(10);
    lotteryNumbers[2] = randNum.nextInt(10);
    lotteryNumbers[3] = randNum.nextInt(10);
    lotteryNumbers[4] = randNum.nextInt(10);

    return lotteryNumbers[4];
}