Does Java have a multiset data structure like the one in C++ STL?

Question

I need a data structure which works like the STL multiset but the TreeSet in Java doesn\'t allow duplicate elements. Is there any built-in data structure in Java which is eq

Answer 1

TreeSet set = new TreeSet<>();
TreeSet multiset = new TreeSet<>((i, j) -> i < j ? 1 : -1);

Make a set multiset just by making 1 != 1!