IntStream与普通Stream相比有什么优势? [英] What is the advantage of IntStream over usual Stream?

问题描述

IntStream，DoubleStream或LongStream比Java 8中的常规流更好吗?

How is IntStream, DoubleStream, or LongStream better than regular stream in Java 8?

这些线程是否具有高性能或可用性?

Do these threads have high performance or maybe usability?

推荐答案

Stream<Integer>等必须使用装箱的值(Integer而不是原始的int)，这会占用更多的内存，并且通常需要大量装箱/取消装箱操作(取决于您的代码).为什么只有Int/Double/Long?仅仅是因为人们期望它们被最频繁地使用.

Stream<Integer> etc. have to work with boxed values (Integer instead of primitive int) which takes significantly more memory and usually a lot of boxing/unboxing operations (depending on your code). Why only Int/Double/Long? Just because they were expected to be used most often.

对OptionalInt和朋友以及所有功能界面都相同.

Same applies to OptionalInt and friends and all the functional interfaces.

对于集合(列表/地图/集合)，出于相同的原因，有许多第三方库提供原始专业化.确实存在更严重的问题，因为使用流时(通常； sorted()是一个反例)，您不需要在内存中存储许多值.

For collections (lists/maps/sets) there are many third-party libraries providing primitive specialization for the same reason. Really the problem there is even more acute because with streams you don't (usually; sorted() is a counter-example) need to store many values in memory.

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