由网友(余生一个你)分享简介：我正在学习 Java 8 的新功能，在尝试使用流 (java.util.stream.Stream) 和收集器时，我意识到一个流不能被使用两次.I'm learning the new Java 8 features, and while experimenting with streams (java.util.s...

我正在学习 Java 8 的新功能，在尝试使用流 (java.util.stream.Stream) 和收集器时，我意识到一个流不能被使用两次.

I'm learning the new Java 8 features, and while experimenting with streams (java.util.stream.Stream) and collectors, I realized that a stream can't be used twice.

有没有办法重复使用它?

Is there any way to reuse it?

推荐答案

来自 文档:

一个流只能被操作(调用一个中间或终端流操作)一次.

A stream should be operated on (invoking an intermediate or terminal stream operation) only once.

如果检测到流正在被重用，流实现可能会抛出 IllegalStateException.

A stream implementation may throw IllegalStateException if it detects that the stream is being reused.

所以答案是否定的，流不应该被重用.

So the answer is no, streams are not meant to be reused.