Java 8 Stream进行实战总结及原理应用
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2022-05-24 14:26:02
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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*上一些经常被问到关于Java 8 Stream的问题:
Convert Java 8
List<V>
intoMap<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
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 <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));
用StreamEx API:
StreamEx.of(persons).distinctBy(Person::getName);
Is it possible to cast a Stream in Java 8?
用JDK Stream API:
Stream.of(objects) .filter(Client.class::isInstance) .map(Client.class::cast) .map(Client::getID) .forEach(System.out::println);
用StreamEx API:
StreamEx.of(objects) .select(Client.class) .map(Client::getID) .forEach(System.out::println);
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