Java FAQ: Top Questions

54. What is the Java Native Interface (JNI)?

Java Native Interface (JNI) allows Java code to interact with native code (C/C++) for performance-critical tasks or platform-specific functionality.

Native Methods: Declared with native keyword, implemented in C/C++.
JNIEnv: Interface for accessing Java objects and methods from native code.
Compilation: Requires generating headers with javac -h and linking native libraries.
Use Case: Accessing hardware, legacy libraries, or optimizing performance.
Risks: Platform-dependent, potential memory issues.

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