native keyword in java
The " native " keyword can be applied to a method to indicate that the method is implemented in a language other then Java such as C or C++.
When a method is marked as native, it can not have a body and should end with a semicolon.
The Java Native Interface is responsible for writing Java native methods and embedding the JavaTM virtual machine into native applications.
Example
- public class JavaNativeExample {
- public native int add(int num1,int num2);
- }
public class JavaNativeExample {
public native int add(int num1,int num2);
}
Now add(int num1,int num2) method is defined in native language other than Java either in C or C++ but it can be called in Java code using the object of above class as below
- JavaNativeExample nativeEx = new JavaNativeExample();
- int res = nativeEx.add(10,20);
JavaNativeExample nativeEx = new JavaNativeExample(); int res = nativeEx.add(10,20);
Native methods are usually used to interface with system calls or libraries written in other programming languages.
Please look at the below link for more details on JNI
http://docs.oracle.com/javase/7/docs/technotes/guides/jni/
