Java NIO Tutorial

By Jakob Jenkov	Share on Facebook Connect with me:

Java NIO (New IO) is an alternative IO API for Java (from Java 1.4), meaning alternative to the standard Java IO API's. Java NIO offers a different way of working with IO than the standard IO API's.

Java NIO: Channels and Buffers

In the standard IO API you work with byte streams and character streams. In NIO you work with channels and buffers. Data is always read from a channel into a buffer, or written from a buffer to a channel.

Java NIO: Asynchronous IO

Java NIO enables you to do asynchronous IO. For instance, a thread can ask a channel to read data into a buffer. While the channel reads data into the buffer, the thread can do something else. Once data is read into the buffer, the thread can then continue processing it. The same is true for writing data to channels.

Java NIO: Selectors

Java NIO contains the concept of "selectors". A selector is an object that can monitor multiple channels for events (like: connection opened, data arrived etc.). Thus, a single thread can monitor multiple channels for data.

Java NIO: Table of Contents

Here is the table of contents for this Java NIO tutorial:

Java NIO
		Java NIO Introduction
		Java NIO Overview
		Java NIO Channel
		Java NIO Buffer
		Java NIO Scatter / Gather
		Java NIO Channel to Channel Transfer
		Java NIO Selector
		Java NIO FileChannel
		Java NIO SocketChannel
		Java NIO ServerSocketChannel
		Java NIO DataGramChannel
		Java NIO Pipe
		Java NIO vs. IO