Java8 lambda - Remove duplicates in List

到這個程度的時候, 我也基本放棄閱讀代碼了. a, b, c, m 看着暈.

令人髮指

List<Customer> distinctCustomers = customers.stream()
    .collect(Collectors.collectingAndThen(
        Collectors.toMap(c -> Arrays.asList(c.getName(), c.getDayOfBirth()),
                         Function.identity(), (a,b) -> a, LinkedHashMap::new),
        m -> new ArrayList<>(m.values())));