"Java I/O, NIO, and NIO.2" is a comprehensive technical book that serves as an accelerated guide and reference work for the Java I/O, NIO, and NIO.2 implementations. It covers key topics such as buffers, files, sockets, datagrams, and pipe channels. Readers gain valuable insights into the use of selectors, regular expressions, as well as working with character encodings, formatters, and scanners. The book not only imparts theoretical knowledge but also practical skills for applying NIO and NIO.2 technologies, which are essential for developing efficient applications with optimized data access. In particular, it addresses the requirements of modern cloud computing and streaming data access, making the book a valuable resource for developers looking to deepen their knowledge of Java programming.