When the Java platform is deployed on top of host environments, it may become desirable or necessary to allow Java applications to work closely with native code written in other languages. Programmers have begun to adopt the Java platform to build applications that were traditionally written in C and C++. Because of the existing investment in legacy code, however, Java applications will coexist with C and C++ code for many years to come.

The JNI is a powerful feature that allows you to take advantage of the Java platform, but still utilize code written in other languages. As a part of the Java virtual machine implementation, the JNI is a two-way interface that allows Java applications to invoke native code and vice versa.

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