How to pick a random number from a specific set?

Newbie & Debugging Questions
#1 
          Suppose I wanted to get a random number that is either: 160, 320, or 480. How would I go about only picking one of those numbers at random? Thank you.
#2 
public int randomNumber(Random RNG, int multiple, int max) {
	return RNG.nextInt(max) * multiple;
}

or

public int randomNumber(int[] set, Random RNG) {
	return set[RNG.nextInt(set.length)];
}

Something like that?

#3

If you’re looking for something like the second option, then you could even go more generic

public <T> T randomNumber(T[] set, Random RNG) {
   return (T) set[RNG.nextInt(set.length)];
}
#4

:-* Thank you. :-* :-* :-* :-* :-* :-* :-*