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859天前public class Sample1 { |
public native int intMethod(int n); |
public native boolean booleanMethod(boolean bool); |
public native String stringMethod(String text); |
public native int intArrayMethod(int[] intArray); |
public static void main(String[] args) { |
System.loadLibrary("Sample1"); |
Sample1 sample = new Sample1(); |
int square = sample.intMethod(5); |
boolean bool = sample.booleanMethod(true); |
String text = sample.stringMethod("Java"); |
int sum = sample.intArrayMethod(new int[] {1, 2, 3, 4, 5, 8, 13}); |
System.out.println("intMethod: " + square); |
System.out.println("booleanMethod: " + bool); |
System.out.println("stringMethod: " + text); |
System.out.println("intArrayMethod: " + sum); |
} |
} |
//c语言版 |
---------------------- - |
#include "Sample1.h" |
#include <string.h> |
JNIEXPORT jint JNICALL Java_Sample1_intMethod |
(JNIEnv * env, jobject obj, jint num) { |
return num * num; |
} |
JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod |
(JNIEnv * env, jobject obj, jboolean boolean) { |
return !boolean; |
} |
JNIEXPORT jstring JNICALL Java_Sample1_stringMethod |
(JNIEnv * env, jobject obj, jstring string) { |
const char * str = ( * env)->GetStringUTFChars(env, string, 0); |
char cap[128]; |
strcpy(cap, str); |
( * env)->ReleaseStringUTFChars(env, string, 0); |
return ( * env)->NewStringUTF(env, strupr(cap)); |
} |
JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod |
(JNIEnv * env, jobject obj, jintArray array) { |
int i, sum = 0; |
jsize len = ( * env)->GetArrayLength(env, array); |
jint * body = ( * env)->GetIntArrayElements(env, array, 0); |
for (i = 0; i < len; ++i) { |
sum += body[i]; |
} |
( * env)->ReleaseIntArrayElements(env, array, body, 0); |
return sum; |
} |
//c++语言版 |
---------------------- - |
#include "Sample1.h" |
#include <string.h> |
JNIEXPORT jint JNICALL Java_Sample1_intMethod |
(JNIEnv * env, jobject obj, jint num) { |
return num * num; |
} |
JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod |
(JNIEnv * env, jobject obj, jboolean boolean) { |
return !boolean; |
} |
JNIEXPORT jstring JNICALL Java_Sample1_stringMethod |
(JNIEnv * env, jobject obj, jstring string) { |
const char * str = env->GetStringUTFChars(string, 0); |
char cap[128]; |
strcpy(cap, str); |
env->ReleaseStringUTFChars(string, 0); |
return env->NewStringUTF(strupr(cap)); |
} |
JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod |
(JNIEnv * env, jobject obj, jintArray array) { |
int i, sum = 0; |
jsize len = env->GetArrayLength(array); |
jint * body = env->GetIntArrayElements(array, 0); |
for (i = 0; i < len; ++i) { |
sum += body[i]; |
} |
env->ReleaseIntArrayElements(array, body, 0); |
return sum; |
} |
