Trying to get lowest integers

Question

So I have 4 list, I want to find out which list.size(); is the lowest. I can find the lowest but some turn out to be the same, this is what I have.

Answer 1

after lot of logic research i got solution,it works 100% and i tested it

first found minimum sized list's size using treeset

put all list and their sizes into map

iterate map to find all lowest sized list(if there are more than one) using above lowest size as a key and put only those into finallist

then take finalist and take random number using its size

then pass this random number to final list get method get corresponding list randomly.

List list1 = new ArrayList();
    list1.add(1);
    list1.add(2);
    List list2 = new ArrayList();
    list2.add(1);
    list2.add(2);
    List list3 = new ArrayList();
    list3.add(1);
    list3.add(2);
    list3.add(1);
    List list4 = new ArrayList();
    list4.add(1);
    list4.add(2);
    list4.add(1);
    list4.add(2);


    Set set = new TreeSet<>();
    set.add(list1.size());
    set.add(list2.size());
    set.add(list3.size());
    set.add(list4.size());

    List list = new ArrayList<>(set);
    int min = list.get(0);
    System.out.println(min);


    Map map = new HashMap<>();

    map.put(list1,list1.size());
    map.put(list2,list2.size());
    map.put(list3,list3.size());
    map.put(list4,list4.size());



    List finalList = new ArrayList<>();

    for (Map.Entry entry : map.entrySet())
    {
        if(entry.getValue().equals(min)){
            finalList.add(entry.getKey());

        }

    }


    int finalKey = new Random().nextInt(finalList.size());

    System.out.println(finalList.get(finalKey));