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Java interview questions: - How will you explain Native Interface in JAVA?

JNI is a mechanism by which you can invoke method written in native language like C and C++. Native languages allow you to use a platform specific feature which is not in control of java language. For instance if you want java to interact directly with some specific type of hardware it will extremely difficult to achieve it. So you can write a C code and declare its native methods and call the same in Java.

Figure: - JNI in action

The above figure indicates how JVM interacts with JNI and without. With JNI it has the extra layer of C or C++ DLL i.e. native source code or native methods which interacts with the operating system.

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Author:
Shivprasad Koirala
We conduct training for Java/J2EE technologies like design patterns, J2EE, Struts, Hibernate, Spring, Rich Interface etc. and likes to write articles on the same in free time.
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