摘要：在這片文章里，主要介紹怎么用的開源框架來解答上一些經常被問到關于的問題用用用用用用用用

在這片文章里，主要介紹怎么用Java 8 Stream的開源框架 StreamEx來解答StackOverflow上一些經常被問到關于Java 8 Stream的問題：

Convert Java 8 List into Map

用JDK Stream API:

Map result =
    choices.stream().collect(Collectors.toMap(Choice::getName,
                                              Function.identity()));

用StreamEx API：

Map result = StreamEx.of(choices).toMap(Choice::getName);

Custom thread pool in Java 8 parallel stream

用JDK Stream API:

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();

用StreamEx API：

IntStreamEx.range(1, 1_000_000).parallel(new ForkJoinPool(2))
           .filter(PrimesPrint::isPrime).toList();

Java 8 Distinct by property

用JDK Stream API:

public static  Predicate distinctByKey(Function keyExtractor) {
    Set