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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