如何转换可选的<T>进入 Stream <T>? [英] How to convert an Optional<T> into a Stream<T>?
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问题描述
I want to prepend a stream with an Optional. Since Stream.concat can only concatinate Streams I have this question:
How do I convert an Optional<T> into a Stream<T>?
Example:
Optional<String> optional = Optional.of("Hello");
Stream<String> texts = optional.stream(); // not working
解决方案
In Java-9 the missing stream() method is added, so this code works:
Stream<String> texts = optional.stream();
See JDK-8050820. Download Java-9 here.
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