(This set of video tutorials is rich in content, with thorough explanations, from shallow to deep, step by step. Each technical point has both theoretical explanations and supporting practical cases. A true blend of theory and practice. The content of the tutorial covers: blocking and non-blocking IO, Channel channel, Buffer buffer, Selector selector, Pipe pipeline, FileLock file lock, as well as Path, Files, asynchronous FileChannel and Charset character encoding, etc., and through a comprehensive multi-personal chat room case , put all the knowledge points of NIO into practical applications.)