JNI
JNI (Java Native Interface) is a programming framework that enables Java code running in a Java Virtual Machine (JVM) to call and be called by native applications and libraries written in languages like C, C++, or assembly. It provides a bridge for integrating platform-specific functionality or performance-critical code into Java applications, allowing developers to leverage existing native codebases or system-level APIs.
Developers should learn JNI when they need to access system-level features not available in pure Java, optimize performance-critical sections by writing them in native code, or integrate with legacy native libraries. It is essential for building cross-platform applications that require low-level hardware interaction, such as in embedded systems, gaming, or scientific computing, where direct memory management or CPU-intensive operations are necessary.