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The Java tutorial at https://docs.oracle.com/javase/tutorial/ has still not been changed to reflect the changes that were added to Java after Java 8. Why is the Java tutorial has still not been added the changes that were added to Java after Java 8?
I do not see Oracle jumping in on this, so I'll offer my experience:
Characteristically when a company embarks on a more accelerated development paradigm, the documentation always suffers. I suspect Oracle has not hired the extra technical writers to keep the documentation current, and the engineers no longer have the time.