Java NIO is a package that contains NIO (Non-blocking Input Output) classes. Java.nio is a top-level package for NIO systems. The NIO system offers a different
The NIO APIs were developed to provide users with access to more efficient, low-level I/O operations available in modern operating systems. However, the NIO APIs were not introduced as an alternate to Java’s native I/O systems.
NIO APIs are relatively high-level and provide developers with easy access to modern I/O operations that are currently available.
The NIO package works by enabling a buffer-based approach to read and write data. Data is read from a channel into a buffer and is similarly written to a channel from a buffer. This buffer-based approach allows non-blocking since threads are free to do other tasks while the channel reads the data from the buffer or writes it to the buffer.
Buffers are containers for a fixed amount of data of specific data types.
NIO transports the time-consuming I/O operations to the buffers, allowing threads to move to other processes and, thus, speeding up the system.