Java 8 Distinct by property

Question

In Java 8 how can I filter a collection using the Stream API by checking the distinctness of a property of each object?

For example I have a list of

Answer 1

There's a simpler approach using a TreeSet with a custom comparator.

persons.stream()
    .collect(Collectors.toCollection(
      () -> new TreeSet((p1, p2) -> p1.getName().compareTo(p2.getName())) 
));