How to intersect multiple sets?

Question

I have this list:

private List<Set<Address>> scanList; 

So my list contains multiple scans as you can see. After each scan I add new set into the list.

After all scans are finished I would like to take only the addresses that occur in every set and put it into:

private List<Address> addresses; 

Does something like this already exists in Set/TreeSet/HashSet?

EDIT: after answers, retainAll() is the right method. Thank you. Here is the source:

Set<Address> addressCross = scanList.get(0); for (int i = 1; i < scanList.size(); i++) {     addressCross.retainAll(scanList.get(i)); }    for (Address address : addressCross) {     addresses.add(address); } 

Answer 1

you can use retainAll(Collection<?> c), check it out here

A side note: that operation is called intersection.

To convert then it to a List you can use the method addAll(Collection<? extends E> c) which should work between all kinds of containers.

eg:

ArrayList<Address> list = new ArrayList<Address>(); list.addAll(yourSet);