Java FileNotFoundException.getMessage() is a method in the Java FileNotFoundException class that returns the detail message string of the exception. It provides information about why the file was not found, such as an incorrect file path or missing file. Introduced in Java 1995 with Java 1.0, getMessage() is essential for diagnosing issues when handling file I/O exceptions in Java applications.

https://docs.oracle.com/javase/8/docs/api/java/io/FileNotFoundException.html