小結本文探討了Stream的實作原理，介紹瞭如何用Java 8 Stream的開源框架StreamEx來解答StackOverflow上一些常被問到關於Java 8 Stream的問題：
#Convert Java 8 List<V> into Map<K, V>
用JDK Stream API:
Map<String, Choice> result =
choices.stream().collect(Collectors.toMap(Choice::getName,
Function.identity()));用StreamEx API：
Map<String, Choice> result = StreamEx.of(choices).toMap(Choice::getName);
Custom thread pool in Java 8 parallel stream
ForkJoinPool forkJoinPool = new ForkJoinPool(2);
forkJoinPool.submit(() ->
//parallel task here, for example
IntStream.range(1, 1_000_000).parallel().filter(PrimesPrint::isPrime).collect(toList())
).get();IntStreamEx.range(1, 1_000_000).parallel(new ForkJoinPool(2))
.filter(PrimesPrint::isPrime).toList();public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
Set<Object> seen = ConcurrentHashMap.newKeySet();
return t -> seen.add(keyExtractor.apply(t));
}
persons.stream().filter(distinctByKey(Person::getName));StreamEx.of(persons).distinctBy(Person::getName);
Stream.of(objects)
.filter(Client.class::isInstance)
.map(Client.class::cast)
.map(Client::getID)
.forEach(System.out::println);StreamEx.of(objects)
.select(Client.class)
.map(Client::getID)
.forEach(System.out::println);
以上是Java 8 Stream進行實戰總結及原理應用的詳細內容。更多資訊請關注PHP中文網其他相關文章！
