You're equivocating again. Still.. Stop. "API" is also idiom for headers nobody human ever looks at except to check their memory of facts, i.e. headers that let compilers and linkers connect code to an external (and valuable) implementation of the API itself. Nobody who habitually discusses these things ever gets confused, because the distinction, in context, is always clear to adequately rested and caffeinated professionals.
Oracle's copyrights on Java material subsist in its implementations of the Java API, and its descriptions of it, its expressions of it, each "fixed in a tangible medium" which can, hence, be, you know, copied.
There are many expository, meaningful descriptions of that API, from at least dozens of authors, "fixed" in a medium. They can be copied.
There are Implementations of that API, from maybe as many as a dozen implementors, "fixed" in a medium. They can be copied.
The API itself is an abstraction. Only descriptions or implementations of it can even so much as constitute a particular offering and arrangement of (purported) "facts" about it. You go find anybody a true "copy of the Java API" fixed in a tangible medium of expression, and then go find any scrap of a copy of it in Google's offering. Oracle already tried, with a hundred million dollars on the line. It, umm, it didn't go very well for them.
Copyright interest in any particular implementation or description does not grant Oracle a monopoly. Yes, the Java API itself is extremely valuable. It's good work. It can't. itself be copied. Expressions of it, descriptions or implementations of it, can be copied. Many, many different attempts to express that API can be and have been "fixed in a tangible medium of expression". The relevant ones are, demonstrably and generally obviously not copies of each other, utterly different attempts trying to express the same thing. Once you've fixed your attempt, your work, you've got your own implementation or description. Someone else comes up another, that's their version.
You might argue anything and everything that attempts to express that API is a "derivative work", and hence Oracle have copyright interest in every attempt at expression, every book, every implementation, every website, that takes a crack at it, that Oracle can demand whatever license fees they think they think they can cart off from every one of them. The only problem is,
The copyright in a compilation or derivative work extends only to the material contributed by the author of such work, as distinguished from the preexisting material employed in the work, and does not imply any exclusive right in the preexisting material. The copyright in such work is independent of, and does not affect or enlarge the scope, duration, ownership, or subsistence of, any copyright protection in the preexisting material.
"Does not affect or enlarge the scope etc. of any copyright protection in the preexisting material." Oracle tried to find some, any, of their own preexisting material in Google's expression of the Java API. They tried. Hard. That, umm, that didn't go very well for them.
Go ahead and snipe all you like, I'm done. Oracle doesn't have a copyright on the API, they don't have a patent on it, nobody could confuse Google's offering for Oracle's (nobody who might conceivably be confused even knows about it, everybody else knows the difference) so whatever trademark interest they may have isn't being infringed.