Set help...

So, what I'm trying to do in this nippet of code is make an Integer set that is equal to [b]nums[/b](another integer set) WITHOUT it changing [b]nums[/b]. For some reason, [b]nums[/b] always gets changed during these lines of code. How can I make this code NOT modify the [b]nums[/b] variable? I'm really stuck here.

[code]Random randomNumberGenerator = new Random(); ]
Set numsCopy = nums;
while (numsCopy.size() < 16){
int randomIndex = randomNumberGenerator.nextInt(31);
String stringArray = numsCopy.toString();[/code]
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