If you want to remove duplicate entries from your array list you can use hash set to make all items unique rather than use of algorithms.

Set is a ordered collection of items and contains only unique items. And Hashset creates a collection that uses a hash table for storage. It stores items by using Hashing maintain key for each items and remove duplication.

   Set<String> hsName = new HashSet<>();
        Set<String> hsId = new HashSet<>();

        ArrayList<String> alName = new ArrayList<>();
        ArrayList<String> alId = new ArrayList<>();

        for (int i = 0 ; i< yourList.size();i++){
            alName.add(yourList.get(i).getSkillName());
            alId.add(yourList.get(i).getSkillId());

        }

        hsName.addAll(alName);
        alName.clear();
        alName.addAll(hsName);

        hsId.addAll(alId);
        alId.clear();
        alId.addAll(hsId);