.stream() 和 Stream.of 有什么区别?

2022-01-22 00:00:00 java-8 java java-stream

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(entities);

推荐答案

第二个没有做你想的那样！它确实不为您提供包含集合元素的流；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集合元素的流，那么你必须使用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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