How to print keys with duplicate values in a hashmap?

Question

I have a hashmap with some keys pointing to same values. I want to find all the values that are equal and print the corresponding keys.

This is the current code that I

Answer 1

You can use streams to retrive duplicates in this way:

  List myList = map.stream()
     .filter(n -> Collections.frequency(map.values(), n) > 1)
     .collect(Collectors.toList());

And then, you can print this out with:

myList.foreach(System.out::println);