Generate random numbers from 0 to 7 with every number appearing 2 times in java ADT

I need to generate random numbers from 0 to 7 with every number appearing 2 times. The end result should have every number appearing 2 times, in random order. An example would be: MyArray = [3, 6, 0, 5, 2, 2, 6, 7, 5, 4, 7, 1, 3, 1, 0, 4]. This is what I tried to do. The code works alone but not in an ADT environnement (in an adapter class that is visited 16 times, but only 14 when I use this code).

ArrayList<Integer> nombres = new ArrayList<Integer>();
private int getRandomNumber() {

    Random rand = new Random();
    int temp;

    while(true){
        temp = rand.nextInt(8);

        if (nombres.size()==0) {
            nombres.add(temp);
            return temp;
        }

        if (nombres.contains(temp)){
            if (nombres.indexOf(temp) == nombres.lastIndexOf(temp)){
                nombres.add(temp);
                return temp;
            }
        }

        if (!nombres.contains(temp)){
            nombres.add(temp);
            return temp;
        }



    }

}

Any other, easier solutions? (I have tried to put everything in a single if, same result).