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

Another method using Java 8 streams you can also do pretty cool:

List CustomerLists;
List unique = CustomerLists.stream().collect(collectingAndThen(
        toCollection(() -> new TreeSet<>(comparingLong(Customer::getId))),
        ArrayList::new));