Remove duplicate elements from an ArrayList in Java

Question

How can I eliminate duplicate elements from Java ArrayList

Answer 1

You can perform this task by performing the following:

arrayList = new ArrayList<String>(new LinkedHashSet<String>(arrayList));

Answer 2

List<String> al = new ArrayList<>();
// add elements to al, including duplicates
Set<String> hs = new HashSet<>();
hs.addAll(al);
al.clear();
al.addAll(hs);