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What is the difference between java method and native method?
Yes, native methods are methods whose implementation is written in a different language than Java. Following are the steps to use native methods.
Create a header file (.h file) for a C program.
Create C file
Create a DLL
In java code, declare the method as native, load the DLL using System.loadLibrary() method and call the method.
Example
Consider the following example −
Tester.java
public class Tester
public class Tester {
public native int getValue(int i);
public static void main(String[] args) {
System.loadLibrary("Tester");
System.out.println(new Tester().getValue(2));
}
}Tester.c
#include <jni.h>
#include "Tester.h"
JNIEXPORT jint JNICALL Java_Tester_getValue(JNIEnv *env, jobject obj, jint i) {
return i * i;
}Compile and run
javac Tester.java
javah -jni Tester
gcc -shared -fpic -o libTester.so -I${JAVA_HOME}/include \
-I${JAVA_HOME}/include/linux Tester.c
java -Djava.library.path =. TesterOutput
4
Updated on 18-Jun-2020 05:50:55
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