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

this can solve the problem:

private List clearListFromDuplicateFirstName(List list1) {

     Map cleanMap = new LinkedHashMap();
     for (int i = 0; i < list1.size(); i++) {
         cleanMap.put(list1.get(i).getFirstName(), list1.get(i));
     }
     List list = new ArrayList(cleanMap.values());
     return list;
}