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Summary
As you've seen, there are a lot of features in the NIO library. While some of the new features -- file locking and character sets, for example -- provide new capabilities, many of the features excel in the area of optimization.
At a fundamental level, there's nothing that channels and buffers can do that we couldn't do using the old stream-oriented classes. But channels and buffers allow for the possibility of doing the same old operations much faster -- approaching the maximum allowed by the system, in fact.
But one of the greatest strengths of NIO is that it provides a new -- and much needed -- structuring metaphor for doing input/output in the Java language. Along with such new conceptual (and realizable) entities as buffers, channels, and asynchronous I/O comes the opportunity to rethink I/O procedures in your Java programs. In this way, NIO breathes new life into even the most familiar procedures of I/O and gives us the opportunity to do them differently, and better, than we have before.
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