Java FileChannel.map() is a method in the Java FileChannel class that maps a region of a file directly into memory, allowing efficient read and write access to the file's content. This is particularly useful for working with large files or for memory-mapped file I/O operations. Introduced in Java 2007 with Java 7, map() improves file access speed and is commonly used in applications that need to modify large files or work with direct memory access.

https://docs.oracle.com/javase/8/docs/api/java/nio/channels/FileChannel.html