RFR: 8272137: Make Collection and Optional classes streamable

[liach]

On Mon, 9 Aug 2021 12:28:23 GMT, CC007 <github.com+5381337+CC007 at openjdk.org> wrote:

> create Streamable and ParallelStreamable interface and use them in Collection and Optional

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On a separate note, @CC007 your model falls back to the fairly-old inheritance vs embodiment (extending a class vs using it as a field) debate. Nowadays, I think Java has evolved to reduce excessive reliances on inheritances, as there can be clashes (for example, a class cannot implement a comparator for two different type arguments). Also due to these potential of clashing, in a lot of java code, interface implementation classes avoid implementing multiple interfaces at once.

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PR: https://git.openjdk.java.net/jdk/pull/5050