Need Method to Return only matching numbers in Java

Need Method to Return only matching numbers in Java

/** * This method should compare two Sets of Integers and return a new *
Set of Integers that represent all of the matching numbers. * * For
example, if the lotteryNumbers are (4, 6, 23, 34, 44, 45) and * the
userNumbers are (4, 18, 22, 24, 35, 45) then the returned Set * of
Integers should be (4, 45) * * @param lotteryNumbers the lottery numbers
that were randomly generated. * @param userNumbers the user picked numbers
that were picked in the console. * @return Set of matched numbers */.
public Set<Integer> playLottery (Set<Integer> lotteryNumbers,
Set<Integer> userNumbers) {
Set<Integer> listOfRandom = new HashSet<Integer>(lotteryNumbers);
listOfRandom.equals(lotteryNumbers);
listOfRandom.addAll(lotteryNumbers);
Set<Integer> s = new HashSet<Integer>(userNumbers);
s.equals(userNumbers);
s.addAll(userNumbers);
Set<Integer> e = new HashSet<Integer>();
for (Integer integer : userNumbers) {
if (userNumbers.equals(lotteryNumbers));
userNumbers.remove(lotteryNumbers);
}
return userNumbers;
}
}
As of now it only returns all the userNumbers. I assumed the remove()
method would remove any duplicate values returned.I need this to pass my
unit Test.