In Java, Generate Random Number Excluding Given Array Of Integers

class RandNum {

    public static void main(String[] args) {
        System.out.println("Random: " + getRandom(33, 43, 47, 7, 11, 54, 21));
    }

    public static int getRandom(int... numbers){
        int rand, len;
        do{
            rand = (int)(1+Math.random()*54);
            len = numbers.length;
            while(0 < len && rand != numbers[--len]);
            if(0 == len && rand != numbers[0])
                return rand;
        }while(true);
    }
}

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