是否有算术加法的Java方法参考？

Question

When using streams in Java, is it possible to use a method reference for arithmetic addition (rather than a lambda)?

At the moment (to sum the contents of a stream) I am using stream.reduce(0, (x, y) -> x + y) , but I would like to use something like stream.reduce(0, Math::add) , if it exists.

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On a more general but similar note, does every method/operation in Java have a method reference?

Answer 1

Yes you can use Integer.sum ,

stream.reduce(0, Integer::sum)

Or you can convert the stream to an IntStream and just call sum

stream.mapToInt(Integer::intValue).sum();

Answer 2

You can use Math.addExact

stream.reduce(0, Math::addExact)