What are native methods? How do you use them?

Native methods are methods written in other languages like C, C++, or even assembly language. You can call native methods from Java using JNI. Native methods are used when the implementation of a particular method is present in language other than Java say C, C++.

To use the native methods in java we use the keyword native

public native method_a().

This native keyword is signal to the java compiler that the implementation of this method is in a language other than java.

Native methods are used when we realize that it would take up a lot of rework to write that piece of already existing code in other language to Java.