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The native keyword is used to tell Java that the method you are defining is actually implemented in machine-specific compiled code outside of Java.

It is mainly used to import existing libraries of code compiled in C into Java, but is also used for the "low level" stuff which must be written specifically for each platform. If you try to look through the Java source code for how things like Sockets or the Math class are implemented, you will soon run into native methods.

See the related link below for a well written example of how to use native methods yourself.

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