Java 8 Stream之实战篇

摘要：在这片文章里，主要介绍怎么用的开源框架来解答上一些经常被问到关于的问题用用用用用用用用

在这片文章里，主要介绍怎么用Java 8 Stream的开源框架 StreamEx来解答StackOverflow上一些经常被问到关于Java 8 Stream的问题：

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