Java: what exactly is the difference between NIO and NIO.2?

Question

I don\'t quite understand how different they are from each other so I have some inquiries regarding these two packages.

After looking around a bit on Google, it seems li

Answer 1

NIO.2 introduced asynchronous i/o.

Asynchronous I/O is an approach to non-blocking i/o that is not supported by NIO.

NIO: selectors / reactor pattern

NIO.2: completion handlers / proactor pattern

Thus when on Windows, NIO.2 uses I/O Completion Ports, which should boost performance. Except, nobody knows, because nobody uses Windows on the server side, and if they do, they probably do so because they are heavily invested in .net, and for that reason will most likely not consider using Java.