Remove duplicates from ArrayLists

Question

I have an ArrayList of custom objects. I want to remove duplicate entries.

The objects have three fields: title, subtitle, and id. If a su

Answer 1

List result = new ArrayList();
Set titles = new HashSet();

for(Item item : originalList) {
    if(titles.add(item.getTitle()) {
        result.add(item);
    }
}

add() of the Set returns false if the element already exists.