Java 8 Stream进行实战总结及原理应用

 小结本文探究了stream的实现原理，介绍了怎么用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:

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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

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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