What is a native method in Java?

• A. A method that can only be used in native applications
• B. A method implemented in Java
• C. A method implemented in a language other than Java
• D. A method that interacts with the operating system

Answer: (C)

A native method in Java refers to a method that is implemented in a language other than Java, typically in C or C++. This is facilitated through the Java Native Interface (JNI), which allows Java code running in the Java Virtual Machine (JVM) to call and be called by native applications and libraries written in those languages.

The purpose of native methods is often to handle tasks that require direct interaction with system-level resources, provide access to hardware, or improve performance for specific computational tasks where Java’s standard library may not suffice. By leveraging native methods, developers can utilize existing libraries and experiment with optimizations that are not possible within Java's managed environment.

While Java methods can interact with the operating system, this is not the defining feature of native methods. Rather, it is the implementation in a non-Java language that distinguishes them. This context establishes why the answer is accurate, highlighting the role that native methods play in bridging Java with other programming environments.