Using Java with Other Languages - Java - page 974

JNIEXPORT void JNICALL Java_HelloJni_displayHelloWorld(JNIEnv *env,
jobject this);

Then create a C function that does the work. You must use the same function signature as is
used in the .h file.

This function can do whatever it wants. Note that it is passed two arguments: a JVM environ-
ment variable and a handle for the this object. Table 24-1 shows the correspondence
between Java types and the C types (JNI types) used in the C code.

Table 24-1. Java and JNI types

Java type JNI Java array type JNI

byte jbyte byte[] jbyteArray

short jshort short[] jshortArray

int jint int[] jintArray

long jlong long[] jlongArray

float jfloat float[] jfloatArray

double jdouble double[] jdoubleArray

char jchar char[] jcharArray

boolean jboolean boolean[] jbooleanArray

void jvoid

Object jobject Object[] jobjectArray

Class jclass

String jstring

array jarray

Throwable jthrowable