.stream（）vs Stream.of [英] .stream() vs Stream.of

问题描述

从集合中创建流的最佳方法是：

Which is the best way to create a stream out of a collection:

    final Collection<String> entities = someService.getArrayList();

1. entities.stream（） ;

Stream.of（实体）;

推荐答案

第二个不符合你的想法！它不为您提供包含该集合元素的流;相反，它会给你一个带有单个元素的流，它是集合本身（而不是它的元素）。

The second one does not do what you think it does! It does not give you a stream with the elements of the collection; instead, it will give you a stream with a single element, which is the collection itself (not its elements).

如果你需要一个包含元素的流集合，然后你必须使用 entities.stream（）。

If you need to have a stream containing the elements of the collection, then you must use entities.stream().

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