How do I remove repeated elements from ArrayList?

Question

I have an ArrayList, and I want to remove repeated strings from it. How can I do this?

Answer 1

Java 8 streams provide a very simple way to remove duplicate elements from a list. Using the distinct method. If we have a list of cities and we want to remove duplicates from that list it can be done in a single line -

 List cityList = new ArrayList<>();
 cityList.add("Delhi");
 cityList.add("Mumbai");
 cityList.add("Bangalore");
 cityList.add("Chennai");
 cityList.add("Kolkata");
 cityList.add("Mumbai");

 cityList = cityList.stream().distinct().collect(Collectors.toList());

How to remove duplicate elements from an arraylist