Oracle sued Google, and Google won, 6-2 (RBG was dead, Barrett had not yet been confirmed when the case was heard).
Supreme Court ruled that by applying the Four Factors of Fair Use, Google stayed within Fair Use.
An API specification ends up being a system of organizing things, like the Dewey Decimal System (and thus not really something that can be copyrighted), which in the end marks the first factor for Google. Because Google limited the Android version of the API to just things that were useful for smart phones it won on the second factor too. Because only 0.4% of the code was reused, and mostly was rewritten, Google won on the third factor. And on the market factor, if they held for Oracle, it would harm the public because then "Oracle alone would hold the key. The result could well prove highly profitable to Oracle (or other firms holding a copyright in computer interfaces) ... [but] the lock would interfere with, not further, copyright's basic creativity objectives." So therefore the fourth factor was also pointing in Google's favor.
Whether "java" won or lost is a question of what is "java"? Android can continue to use the Java API- so it is going to see much more activity. But Oracle didn't get to demand license fees, so they are sad.
The district court ruled for Google over patents and copyright- that it was not a copyright at all, the Court of Appeals then reversed and demanded a second court trial on whether Google was doing fair use of Oracle's legitimate copyright, which the district court again held for Google, and then the Court of Appeals reversed the second ruling and held for Oracle that it was not fair use of their copyright, and then Google appealed that to the the Supreme Court ... and won in April 2021, putting an end to this case which was filed in August 2010. But the appeals court in between the district court and the Supreme Court meant that for a long while in the middle Oracle was the winner.
This is part of why patents and copyrights can't be the moat for your company. 11 years, with lots of uncertainty and back-and-forth, to get a final decision.
The gist is the API specification in itself is copyright, so it is copyright infringement then.